platform-drivers-x86: asus-laptop: fix wrong test for successful registered led_classdev
platform-drivers-x86: asus-laptop: fix wrong test for successful registered led_classdev

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 macro for led_cdev->dev instead of checking if led_cdev->dev
is NULL or not.

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 <b6ffd6973e972cb999e8e535ab74da7fee0c035f@gmail.com>
Acked-by: Corentin Chary <4153b5fcec9d8639b77e759711dc8338f0db8708@gmail.com>
Signed-off-by: Matthew Garrett <4cf8d479716eba9bc68e0146d95320fcb138b96b@redhat.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs