message: Fix zval dtor on stack.
diff: @@ -504,7 +504,7 @@ static void http2_client_onReceive(swClient *cli, char *buf, uint32_t _length)
  if (hcc->iowait == 0)
  {
  - sw_zval_free(zresponse);
  + zval_ptr_dtor(zresponse);
  return;
  }
  hcc->iowait = 0;
  