switch ->is_visible() to returning umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/hwmon/max1668.c b/drivers/hwmon/max1668.c
index 20d1b2d..6914195 100644
--- a/drivers/hwmon/max1668.c
+++ b/drivers/hwmon/max1668.c
@@ -335,10 +335,10 @@
 	NULL
 };
 
-static mode_t max1668_attribute_mode(struct kobject *kobj,
+static umode_t max1668_attribute_mode(struct kobject *kobj,
 				     struct attribute *attr, int index)
 {
-	int ret = S_IRUGO;
+	umode_t ret = S_IRUGO;
 	if (read_only)
 		return ret;
 	if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr ||