V4L/DVB (11131): cx231xx: avoid trying to access unfilled dev struct

cx231xxinfo needs dev->name. However, this is not declared on the time the
check for the max number of supported devices is done.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/media/video/cx231xx/cx231xx-cards.c
Simple merge