message: check whether func_cache is null or not in onConnect
diff: @@ -1266,6 +1266,9 @@ void php_swoole_onConnect(swServer *serv, swDataHead *info)
  #else
  int ret;
  zend_fcall_info_cache *cache = php_swoole_server_get_cache(serv, info->from_fd, SW_SERVER_CB_onConnect);
  + if (cache == NULL) {
  + return;
  + }
  if (serv->enable_delay_receive)
  {
  ret = coro_create(cache, args, 3, &retval, php_swoole_onConnect_finish, (void*) (long) info->fd);
  