V4L/DVB (11437): pvrusb2: Drop client_register/unregister stubs
V4L/DVB (11437): pvrusb2: Drop client_register/unregister stubs

The client_register and client_unregister methods are optional so
there is no point in defining stub ones. Especially when these methods
are likely to be removed soon.

Signed-off-by: Jean Delvare <49ad6a9f5aa17024c23048df346d55bda6837e01@linux-fr.org>
Acked-by: Mike Isely <2ea935d8c40c107fcce175c9ba49ff51e4d69087@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <ad86ba2154032c9f55743a190faa2459a9d61d42@redhat.com>

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