leds-lp55xx: fix problem on removing LED attributes

 LP55XX common device attributes, 'led_current' and 'max_current' are created
 while loading the driver.
 Those are LED device attributes which are removed automatically on releasing
 led class devices - led_classdev_unregister().
 Therefore, this duplicate code should be removed.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

drivers/leds/leds-lp55xx-common.c

@@ -478,12 +478,9 @@ void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
 {
 	int i;
 	struct lp55xx_led *each;
-	struct kobject *kobj;
 
 	for (i = 0; i < chip->num_leds; i++) {
 		each = led + i;
-		kobj = &led->cdev.dev->kobj;
-		sysfs_remove_group(kobj, &lp55xx_led_attr_group);
 		led_classdev_unregister(&each->cdev);
 		flush_work(&each->brightness_work);
 	}