message: Fix unused return value warning
diff: @@ -3509,7 +3509,7 @@ static PHP_METHOD(swoole_server, taskwait)
  //clear history task
  while (swSocket_wait(task_notify_socket->fd, 0, SW_EVENT_READ) == SW_OK)
  {
  - read(task_notify_socket->fd, &notify, sizeof(notify));
  + (void) read(task_notify_socket->fd, &notify, sizeof(notify));
  }
  sw_atomic_fetch_add(&serv->stats->tasking_num, 1);
  