backlight: lm3533_bl: Use kobj_to_dev() instead

Use kobj_to_dev() instead of container_of()
Signed-off-by: Wang Qing <wangqing@vivo.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/video/backlight/lm3533_bl.c

@@ -235,7 +235,7 @@ static struct attribute *lm3533_bl_attributes[] = {
 static umode_t lm3533_bl_attr_is_visible(struct kobject *kobj,
 					     struct attribute *attr, int n)
 {
-	struct device *dev = container_of(kobj, struct device, kobj);
+	struct device *dev = kobj_to_dev(kobj);
 	struct lm3533_bl *bl = dev_get_drvdata(dev);
 	umode_t mode = attr->mode;