V4L/DVB (9406): Really silly bug, setting bandwidth into frequency

probably should stop fiddling with code late nights. :-(

Thanks to Marco for pointing it out and fixing it.

Signed-off-by: Marko Schluessler <marco@lordzodiac.de>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>