[media] dvb_usb_v2: make checkpatch.pl happy

New checkpatch version likes to see strings not to split multiple
lines even those are exceeding 80 line length.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>