fs: annotate ->poll() instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 040612e..0510717 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -227,10 +227,10 @@
 	return 0;
 }
 
-static unsigned int timerfd_poll(struct file *file, poll_table *wait)
+static __poll_t timerfd_poll(struct file *file, poll_table *wait)
 {
 	struct timerfd_ctx *ctx = file->private_data;
-	unsigned int events = 0;
+	__poll_t events = 0;
 	unsigned long flags;
 
 	poll_wait(file, &ctx->wqh, wait);