message: Fix null ptr core dump.
diff: @@ -509,7 +509,7 @@ int php_coroutine_reactor_can_exit(swReactor *reactor);
  static sw_inline zval* php_swoole_server_get_callback(swServer *serv, int server_fd, int event_type)
  {
  swListenPort *port = (swListenPort *) serv->connection_list[server_fd].object;
  - if (port == NULL)
  + if (!port)
  {
  swWarn("invalid server_fd[%d].", server_fd);
  return NULL;
  @@ -534,6 +534,11 @@ static sw_inline zval* php_swoole_server_get_callback(swServer *serv, int server
  static sw_inline zend_fcall_info_cache* php_swoole_server_get_cache(swServer *serv, int server_fd, int event_type)
  {
  swListenPort *port = (swListenPort *) serv->connection_list[server_fd].object;
  + if (!port)
  + {
  + swWarn("invalid server_fd[%d].", server_fd);
  + return NULL;
  + }
  swoole_server_port_property *property = (swoole_server_port_property *) port->ptr;
  if (!property)
  {
  