drm/udl: Initialize ret in udl_driver_load

We need to set it to -ENODEV when we don't recognize the device.
Otherwise we return/print stack garbage.

Spotted by coverity.

Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --cc drivers/gpu/drm/udl/udl_main.c
Simple merge