[media] dvb_usb_v2: ensure driver_info is not null

It could be null in case of driver does not set it
properly, like missing dynamic ID handling.

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