fs/epoll: Notify POLLIN directly(avoid set POLLFILE)

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

fs/vfs/fs_epoll.c

@@ -365,7 +365,7 @@ int epoll_ctl(int epfd, int op, int fd, struct epoll_event *ev)
         return -1;
     }
 
-  poll_notify(&eph->poll, 1, eph->poll[0].events);
+  poll_notify(&eph->poll, 1, POLLIN);
   return 0;
 }