V4L/DVB: cx18-alsa: remove unneeded debug line

Remove an unneeded debug line, which was preventing the cx18-alsa module from
loading.

This work was sponsored by ONELAN Limited.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>