sony-laptop: adjust error handling in finding SNC handles
sony-laptop: adjust error handling in finding SNC handles

All handles must be greater than 0, also return more meaningful error
codes on invalid conditions.

Signed-off-by: Mattia Dongili <564ea3fba55f6e029e83434fb6b3f3b9c7ed334e@linux.it>
Signed-off-by: Matthew Garrett <4cf8d479716eba9bc68e0146d95320fcb138b96b@redhat.com>

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