[PATCH 2/3] platform-drivers-x86: asus-wmi: fix resource leak in asus_wmi_led_exit

[Axel Lin <axel.lin@gmail.com>]

This patch fixes wrong test for successful registered led_classdev,
and also fixes a leak due to missing led_classdev_unregister call
for asus->kbd_led in asus_wmi_led_exit.

device_create returns &struct device pointer on success, or ERR_PTR() on error.
Thus if led_classdev_register fails, led_cdev->dev is always not NULL.

Thus to unregister a successful registered led_classdev, we should check
(!IS_ERR_OR_NULL(asus->tpd_led.dev)) instead of (asus->tpd_led.dev).

we use IS_ERR_OR_NULL instead of IS_ERR because if we havn't call
led_classdev_register, the led_cdev->dev is NULL.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
---
 drivers/platform/x86/asus-wmi.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 95cba9e..d1049ee 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -453,7 +453,9 @@ static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
 
 static void asus_wmi_led_exit(struct asus_wmi *asus)
 {
-	if (asus->tpd_led.dev)
+	if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
+		led_classdev_unregister(&asus->kbd_led);
+	if (!IS_ERR_OR_NULL(asus->tpd_led.dev))
 		led_classdev_unregister(&asus->tpd_led);
 	if (asus->led_workqueue)
 		destroy_workqueue(asus->led_workqueue);
-- 
1.7.4.1