asus-laptop: Fix potential invalid pointer dereference
asus-laptop: Fix potential invalid pointer dereference

The 0-day build testing backend noticed that a string could be dereferenced
without validation. Fix that.

Signed-off-by: Matthew Garrett <d1dada306f6f6bc535ec5238317ee8d221588a1a@nebula.com>

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