fix timerfd release

src/eventloop_epoll.c

@@ -141,7 +141,7 @@ int owd_platform_el_add_timer(
   if ((res = el_epoll_add(el, e, tfd, OWD_EVENT_SOURCE_TIMER, EPOLLIN, true)))
     return res;
 
-  FD_RELEASE(tfd);
+  FD_RELEASE(&tfd);
   return 0;
 }