drm/udl: Use unlocked gem unreferencing
For drm_gem_object_unreference callers are required to hold dev->struct_mutex, which these paths don't. Enforcing this requirement has become a bit more strict with commit ef4c6270 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Thu Oct 15 09:36:25 2015 +0200 drm/gem: Check locking in drm_gem_object_unreference Cc: stable@vger.kernel.org Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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