V4L/DVB (9441): Code simplification: clock is already initialized, no need to initialize again.

Thanks to Marko Schluessler <marco@lordzodiac.de> for pointing it out

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>