drm/gem: remove drm_gem_object_handle_unreference

It's unused, everyone is using the _unlocked variant only.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@gmail.com>

include/drm/drmP.h

@@ -1648,24 +1648,6 @@ drm_gem_object_handle_reference(struct drm_gem_object *obj)
 	atomic_inc(&obj->handle_count);
 }
 
-static inline void
-drm_gem_object_handle_unreference(struct drm_gem_object *obj)
-{
-	if (obj == NULL)
-		return;
-
-	if (atomic_read(&obj->handle_count) == 0)
-		return;
-	/*
-	 * Must bump handle count first as this may be the last
-	 * ref, in which case the object would disappear before we
-	 * checked for a name
-	 */
-	if (atomic_dec_and_test(&obj->handle_count))
-		drm_gem_object_handle_free(obj);
-	drm_gem_object_unreference(obj);
-}
-
 static inline void
 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
 {