fanotify: remove reference to fill_event_metadata()

fill_event_metadata() was removed in commit bb2f7b45
("fanotify: open code fill_event_metadata()")

Link: https://lore.kernel.org/r/20200512181836.405879-1-fabf@skynet.beSigned-off-by: Fabian Frederick <fabf@skynet.be>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/notify/fanotify/fanotify_user.c

@@ -328,7 +328,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
 	ret = -EFAULT;
 	/*
 	 * Sanity check copy size in case get_one_event() and
-	 * fill_event_metadata() event_len sizes ever get out of sync.
+	 * event_len sizes ever get out of sync.
 	 */
 	if (WARN_ON_ONCE(metadata.event_len > count))
 		goto out_close_fd;