V4L/DVB (4508): Fix an array overflow on bt866

The Coverity checker spotted the following two array overflows.
Registers 0xcc and 0xdc were cached on reg[] array, with only 128 elements, 
instead of 256.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
1 file changed