[media] netup_unidvb: fix potential crash when spi is NULL
[media] netup_unidvb: fix potential crash when spi is NULL

Signed-off-by: Abylay Ospan <be07f729d89a57ac75a50cd497cd1728d1aa5301@netup.ru>
Reported-by: Dan Carpenter <ff341aa343d564f9e53e9dcb6996be8c04859a66@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <ad86ba2154032c9f55743a190faa2459a9d61d42@osg.samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs