npb error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]

Version: 29.3
Language: C++
system: Linux
g++: 9.3

I build the proto to .c and .h,I don't know if it is correct when I separate the command to generate the .c and .h
```shell
PROTOC_PATH=$(pwd)/../../../../tools/protoc
PROTO_FILES=$(pwd)/*.proto
OUTPUT_DIR=$(pwd)/../../src/proto

$PROTOC_PATH/protoc \
--plugin=protoc-gen-upb=$PROTOC_PATH/protoc-gen-upb \
--upb_out=$OUTPUT_DIR \
--proto_path=$(pwd) $PROTO_FILES

$PROTOC_PATH/protoc \
--plugin=protoc-gen-upb=$PROTOC_PATH/protoc-gen-upb_minitable \
--upb_out=$OUTPUT_DIR \
--proto_path=$(pwd) $PROTO_FILES

$PROTOC_PATH/protoc \
--plugin=protoc-gen-upb=$PROTOC_PATH/protoc-gen-upbdefs \
--upb_out=$OUTPUT_DIR \
--proto_path=$(pwd) $PROTO_FILES
```

Then I test the upb
```cpp
 upb_Arena *arena = upb_Arena_New();
  edge_DrawProperty *draw_property = edge_DrawProperty_new(arena);
  edge_DrawProperty_set_channel_id(draw_property, 12345);
  edge_DrawProperty_set_task_id(draw_property, 67890);
  edge_Box *box = edge_DrawProperty_add_boxes(draw_property, arena);
  edge_Box_set_label(box, 1);
  edge_Box_set_x1(box, 10);
  edge_Box_set_y1(box, 20);
  edge_Box_set_x2(box, 30);
  edge_Box_set_y2(box, 40);
  edge_Box_set_score(box, 100);
  upb_Arena_Free(arena);
```
Then I build the cpp and it shows that
```
model_draw.upb_minitable.c:35:1: error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]
   35 | };
      | ^
model_draw.upb_minitable.c:55:1: error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]
   55 | };
      | ^
model_draw.upb_minitable.c:89:1: error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]
   89 | };
      | ^
model_draw.upb_minitable.c:114:1: error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]
  114 | };
      | ^
model_draw.upb_minitable.c:139:1: error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]
  139 | };
      | ^
model_draw.upb_minitable.c:195:1: error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing]
  195 | };
```
Here is .proto
```proto
syntax = "proto3";

package edge;
option go_package = "./proto/edge";

message Point {
  int32 x = 2;
  int32 y = 3;
}

message Line {
  Point p1 = 2;
  Point p2 = 3;
}

// 框出来的目标
message Box {
  int32 label = 1;
  int32 x1 = 2;
  int32 y1 = 3;
  int32 x2 = 4;
  int32 y2 = 5;
  int32 score = 6;
  repeated Roi belong_rois = 7;
}

message Roi {
  int64 id = 1;
  repeated Point points = 2;
}

message DrawCrowdProperty {
  repeated Box boxes = 1;
  repeated int64 stay_time = 2;
}

message DrawProperty {
  int64 channel_id = 1;
  int64 task_id = 2;
  repeated Box boxes = 3;
  oneof property { DrawProperty crowd = 101; }
}
```
here is model_draw.upb_minitable.c
```c
/* This file was generated by upb_generator from the input file:
 *
 *     model_draw.proto
 *
 * Do not edit -- your changes will be discarded when the file is
 * regenerated.
 * NO CHECKED-IN PROTOBUF GENCODE */

#include <stddef.h>
#include "upb/generated_code_support.h"
#include "model_draw.upb_minitable.h"

// Must be last.
#include "upb/port/def.inc"

extern const struct upb_MiniTable UPB_PRIVATE(_kUpb_MiniTable_StaticallyTreeShaken);
static const upb_MiniTableField edge_Point__fields[2] = {
  {2, 8, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {3, 12, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
};

const upb_MiniTable edge__Point_msg_init = {
  NULL,
  &edge_Point__fields[0],
  16, 2, kUpb_ExtMode_NonExtendable, 0, UPB_FASTTABLE_MASK(24), 0,
#ifdef UPB_TRACING_ENABLED
  "edge.Point",
#endif
  UPB_FASTTABLE_INIT({
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x000800003f000010, &upb_psv4_1bt},
    {0x000c00003f000018, &upb_psv4_1bt},
  })
};

const upb_MiniTable* edge__Point_msg_init_ptr = &edge__Point_msg_init;
static const upb_MiniTableSubInternal edge_Line__submsgs[2] = {
  {.UPB_PRIVATE(submsg) = &edge__Point_msg_init_ptr},
  {.UPB_PRIVATE(submsg) = &edge__Point_msg_init_ptr},
};

static const upb_MiniTableField edge_Line__fields[2] = {
  {2, UPB_SIZE(12, 16), 64, 0, 11, (int)kUpb_FieldMode_Scalar | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
  {3, UPB_SIZE(16, 24), 65, 1, 11, (int)kUpb_FieldMode_Scalar | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
};

const upb_MiniTable edge__Line_msg_init = {
  &edge_Line__submsgs[0],
  &edge_Line__fields[0],
  UPB_SIZE(24, 32), 2, kUpb_ExtMode_NonExtendable, 0, UPB_FASTTABLE_MASK(255), 0,
#ifdef UPB_TRACING_ENABLED
  "edge.Line",
#endif
};

const upb_MiniTable* edge__Line_msg_init_ptr = &edge__Line_msg_init;
static const upb_MiniTableSubInternal edge_Box__submsgs[1] = {
  {.UPB_PRIVATE(submsg) = &edge__Roi_msg_init_ptr},
};

static const upb_MiniTableField edge_Box__fields[7] = {
  {1, 8, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {2, 12, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {3, 16, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {4, 20, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {5, 24, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {6, 28, 0, kUpb_NoSub, 5, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_4Byte << kUpb_FieldRep_Shift)},
  {7, 32, 0, 0, 11, (int)kUpb_FieldMode_Array | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
};

const upb_MiniTable edge__Box_msg_init = {
  &edge_Box__submsgs[0],
  &edge_Box__fields[0],
  40, 7, kUpb_ExtMode_NonExtendable, 7, UPB_FASTTABLE_MASK(56), 0,
#ifdef UPB_TRACING_ENABLED
  "edge.Box",
#endif
  UPB_FASTTABLE_INIT({
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x000800003f000008, &upb_psv4_1bt},
    {0x000c00003f000010, &upb_psv4_1bt},
    {0x001000003f000018, &upb_psv4_1bt},
    {0x001400003f000020, &upb_psv4_1bt},
    {0x001800003f000028, &upb_psv4_1bt},
    {0x001c00003f000030, &upb_psv4_1bt},
    {0x002000003f00003a, &upb_prm_1bt_max64b},
  })
};

const upb_MiniTable* edge__Box_msg_init_ptr = &edge__Box_msg_init;
static const upb_MiniTableSubInternal edge_Roi__submsgs[1] = {
  {.UPB_PRIVATE(submsg) = &edge__Point_msg_init_ptr},
};

static const upb_MiniTableField edge_Roi__fields[2] = {
  {1, UPB_SIZE(16, 8), 0, kUpb_NoSub, 3, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_8Byte << kUpb_FieldRep_Shift)},
  {2, UPB_SIZE(8, 16), 0, 0, 11, (int)kUpb_FieldMode_Array | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
};

const upb_MiniTable edge__Roi_msg_init = {
  &edge_Roi__submsgs[0],
  &edge_Roi__fields[0],
  24, 2, kUpb_ExtMode_NonExtendable, 2, UPB_FASTTABLE_MASK(24), 0,
#ifdef UPB_TRACING_ENABLED
  "edge.Roi",
#endif
  UPB_FASTTABLE_INIT({
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x000800003f000008, &upb_psv8_1bt},
    {0x001000003f000012, &upb_prm_1bt_max64b},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
  })
};

const upb_MiniTable* edge__Roi_msg_init_ptr = &edge__Roi_msg_init;
static const upb_MiniTableSubInternal edge_DrawCrowdProperty__submsgs[1] = {
  {.UPB_PRIVATE(submsg) = &edge__Box_msg_init_ptr},
};

static const upb_MiniTableField edge_DrawCrowdProperty__fields[2] = {
  {1, 8, 0, 0, 11, (int)kUpb_FieldMode_Array | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
  {2, UPB_SIZE(12, 16), 0, kUpb_NoSub, 3, (int)kUpb_FieldMode_Array | (int)kUpb_LabelFlags_IsPacked | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
};

const upb_MiniTable edge__DrawCrowdProperty_msg_init = {
  &edge_DrawCrowdProperty__submsgs[0],
  &edge_DrawCrowdProperty__fields[0],
  UPB_SIZE(16, 24), 2, kUpb_ExtMode_NonExtendable, 2, UPB_FASTTABLE_MASK(24), 0,
#ifdef UPB_TRACING_ENABLED
  "edge.DrawCrowdProperty",
#endif
  UPB_FASTTABLE_INIT({
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x000800003f00000a, &upb_prm_1bt_max64b},
    {0x001000003f000012, &upb_ppv8_1bt},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
  })
};

const upb_MiniTable* edge__DrawCrowdProperty_msg_init_ptr = &edge__DrawCrowdProperty_msg_init;
static const upb_MiniTableSubInternal edge_DrawProperty__submsgs[2] = {
  {.UPB_PRIVATE(submsg) = &edge__Box_msg_init_ptr},
  {.UPB_PRIVATE(submsg) = &edge__DrawProperty_msg_init_ptr},
};

static const upb_MiniTableField edge_DrawProperty__fields[4] = {
  {1, UPB_SIZE(24, 16), 0, kUpb_NoSub, 3, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_8Byte << kUpb_FieldRep_Shift)},
  {2, UPB_SIZE(32, 24), 0, kUpb_NoSub, 3, (int)kUpb_FieldMode_Scalar | ((int)kUpb_FieldRep_8Byte << kUpb_FieldRep_Shift)},
  {3, UPB_SIZE(8, 32), 0, 0, 11, (int)kUpb_FieldMode_Array | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
  {101, UPB_SIZE(16, 40), UPB_SIZE(-13, -9), 1, 11, (int)kUpb_FieldMode_Scalar | ((int)UPB_SIZE(kUpb_FieldRep_4Byte, kUpb_FieldRep_8Byte) << kUpb_FieldRep_Shift)},
};

const upb_MiniTable edge__DrawProperty_msg_init = {
  &edge_DrawProperty__submsgs[0],
  &edge_DrawProperty__fields[0],
  UPB_SIZE(40, 48), 4, kUpb_ExtMode_NonExtendable, 3, UPB_FASTTABLE_MASK(248), 0,
#ifdef UPB_TRACING_ENABLED
  "edge.DrawProperty",
#endif
  UPB_FASTTABLE_INIT({
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x001000003f000008, &upb_psv8_1bt},
    {0x001800003f000010, &upb_psv8_1bt},
    {0x002000003f00001a, &upb_prm_1bt_max64b},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x00280008650106aa, &upb_pom_2bt_max64b},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
    {0x0000000000000000, &_upb_FastDecoder_DecodeGeneric},
  })
};

const upb_MiniTable* edge__DrawProperty_msg_init_ptr = &edge__DrawProperty_msg_init;
static const upb_MiniTable *messages_layout[6] = {
  &edge__Point_msg_init,
  &edge__Line_msg_init,
  &edge__Box_msg_init,
  &edge__Roi_msg_init,
  &edge__DrawCrowdProperty_msg_init,
  &edge__DrawProperty_msg_init,
};

const upb_MiniTableFile model_draw_proto_upb_file_layout = {
  messages_layout,
  NULL,
  NULL,
  6,
  0,
  0,
};

#include "upb/port/undef.inc"
```

Thanks!

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npb error: narrowing conversion of '-1' from 'int' to 'uint8_t' {aka 'unsigned char'} [-Wnarrowing] #20373

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