fs: annotate ->poll() instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 2571404..6fdbf21 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -206,7 +206,7 @@ FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
 		PROTO(struct file *filp, unsigned int cmd, unsigned long arg),
 		ARGS(filp, cmd, arg));
 
-static unsigned int full_proxy_poll(struct file *filp,
+static __poll_t full_proxy_poll(struct file *filp,
 				struct poll_table_struct *wait)
 {
 	struct dentry *dentry = F_DENTRY(filp);