message: build: fix GCC12 compilation
diff: @@ -164,7 +164,7 @@ size_t base64_decode(char const * src, char * dst, size_t off, size_t cnt)
  bool base64_valid(uint8_t const * src, size_t off, size_t cnt)
  {
  /* check parameters */
  - if (src == 0 || src + off == 0)
  + if (src == 0)
  return false;
  if (cnt == 0U)
  cnt = std::strlen(reinterpret_cast<char const *>(src));
  