V4L/DVB (9981): [PATCH] usb-urb.c: Fix initialization of URB list.

Fix the initialization of the URB list for a DVB-USB device to prevent
problems on certain platforms (MIPS).

Signed-off-by: Thomas Reitmayr <treitmayr@devbase.at>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>