leds: class: Make led_remove_lookup() NULL-aware

It is a usual pattern in the kernel to make releasing functions be NULL-aware
so they become a no-op. This helps reducing unneeded checks in the code where
the given resource is optional.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: andy-shev

drivers/leds/led-class.c

@@ -421,6 +421,9 @@ EXPORT_SYMBOL_GPL(led_add_lookup);
  */
 void led_remove_lookup(struct led_lookup_data *led_lookup)
 {
+	if (!led_lookup)
+		return;
+
 	mutex_lock(&leds_lookup_lock);
 	list_del(&led_lookup->list);
 	mutex_unlock(&leds_lookup_lock);