switch ->is_visible() to returning umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index d1994ec..e90eea7 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -55,7 +55,7 @@
 
 struct attribute_group {
 	const char		*name;
-	mode_t			(*is_visible)(struct kobject *,
+	umode_t			(*is_visible)(struct kobject *,
 					      struct attribute *, int);
 	struct attribute	**attrs;
 };