V4L/DVB (13325): gspca - pac7302/pac7311: Fix buffer overrun.

The reg_w_seq() function expects the sequence length in entries
and not in bytes. One entry in init_7302 and init_7311 is two
bytes and not one.

Signed-off-by: Marton Nemeth <nm127@freemail.hu>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>