fs: annotate ->poll() instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index c5cbbdf..6332537 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -630,12 +630,12 @@
 	return 0;
 }
 
-static unsigned int proc_sys_poll(struct file *filp, poll_table *wait)
+static __poll_t proc_sys_poll(struct file *filp, poll_table *wait)
 {
 	struct inode *inode = file_inode(filp);
 	struct ctl_table_header *head = grab_header(inode);
 	struct ctl_table *table = PROC_I(inode)->sysctl_entry;
-	unsigned int ret = DEFAULT_POLLMASK;
+	__poll_t ret = DEFAULT_POLLMASK;
 	unsigned long event;
 
 	/* sysctl was unregistered */