message: fixed swoole_client->close cannot close bad connection.
diff: @@ -1581,9 +1581,10 @@ static PHP_METHOD(swoole_client, close)
  return;
  }
  - swClient *cli = client_get_ptr(getThis() TSRMLS_CC);
  - if (!cli)
  + swClient *cli = swoole_get_object(getThis());
  + if (!cli || !cli->socket)
  {
  + swoole_php_fatal_error(E_WARNING, "client is not connected to server.");
  RETURN_FALSE;
  }
  if (cli->socket->closed)
  