* FIX [mqtt_codec] Fix the wrong calculation in length of properties.

src/supplemental/mqtt/mqtt_codec.c

@@ -2270,10 +2270,12 @@ nni_mqttv5_msg_decode_publish(nni_msg *msg)
  }
 
  uint32_t pos = buf.curpos - &body[0];
- uint32_t prop_len = 0;
+ uint32_t prop_len = 0, prop_sz;
+ uint32_t pos1 = pos;
  mqtt->var_header.publish.properties =
  decode_buf_properties(body, length, &pos, &prop_len, true);
  buf.curpos = &body[0] + pos;
+ prop_sz = pos - pos1;
 
 
  /* Payload */
@@ -2283,7 +2285,7 @@ nni_mqttv5_msg_decode_publish(nni_msg *msg)
  a PUBLISH Packet to contain a zero length payload.*/
  mqtt->payload.publish.payload.length =
  mqtt->fixed_header.remaining_length -
- (2 /* Length bytes of Topic Name */ + 1 + prop_len +
+ (2 /* Length bytes of Topic Name */ + prop_sz +
  mqtt->var_header.publish.topic_name.length + packid_length);
  mqtt->payload.publish.payload.buf =
  (mqtt->payload.publish.payload.length > 0) ? buf.curpos : NULL;