[media] drivers/media/video/cx23885/cx23885-core.c: fix cx23885_dev_checkrevision()

It was missing the `break'.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=18672



Reported-by: Igor <i2g2r2@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>