message: Fix onTimeout coredump on legacy kernel.
diff: @@ -2835,6 +2835,11 @@ static int swoole_mysql_coro_close(zval *zobject)
  }
  //clear connector
  + if (client->connector.timer)
  + {
  + swTimer_del(&SwooleG.timer, client->connector.timer);
  + client->connector.timer = NULL;
  + }
  if (client->connector.host)
  {
  efree(client->connector.host);
  