message: fix process free object
diff: @@ -326,6 +326,7 @@ static PHP_METHOD(swoole_process, __destruct)
  SW_PREVENT_USER_DESTRUCT;
  swWorker *process = swoole_get_object(getThis());
  + swoole_set_object(getThis(), NULL);
  swPipe *_pipe = process->pipe_object;
  if (_pipe)
  {
  