leds: Fix trigger unregister_simple if register_simple fails

Fix led_trigger_unregister_simple to handle the case where
led_trigger_register_simple fails, avoiding a NULL pointer
dereference.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 454fb09..129733f 100644 (file)
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -215,7 +215,8 @@ void led_trigger_unregister(struct led_trigger *trigger)
 
 void led_trigger_unregister_simple(struct led_trigger *trigger)
 {
-       led_trigger_unregister(trigger);
+       if (trigger)
+               led_trigger_unregister(trigger);
        kfree(trigger);
 }