message: fix code scanning issue
diff: @@ -501,8 +501,8 @@ void Dumper::dumpValue(Slice const* slice, Slice const* base) {
  _sink->push_back('"');
  ValueLength len;
  uint8_t const* bin = slice->getBinary(len);
  - for (uint8_t i = 0; i < len; i++) {
  - uint8_t value = *(bin+i);
  + for (ValueLength i = 0; i < len; ++i) {
  + uint8_t value = bin[i];
  uint8_t x = value / 16;
  _sink->push_back((x < 10 ? ('0' + x) : ('a' + x - 10)));
  x = value % 16;
  