switch ->is_visible() to returning umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 194414f..dd1701c 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -33,7 +33,7 @@
 	int error = 0, i;
 
 	for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) {
-		mode_t mode = 0;
+		umode_t mode = 0;
 
 		/* in update mode, we're changing the permissions or
 		 * visibility.  Do this by first removing then