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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 454fb0901f82..129733f2379b 100644
--- 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);
 }