Fix the first, botched attempt at preventing direct use of a user pointer in
ivtv_write_vbi().
Reported-by: NDr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: NAndy Walls <awalls@md.metrocast.net>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>