drm/qxl: add NULL check for bo->resource

When allocations fails that can be NULL now.

Signed-off-by: Christian König <[email protected]>
Reported-by: Daniel Bristot de Oliveira <[email protected]>
Tested-by: Daniel Bristot de Oliveira <[email protected]>
Tested-by: Roberto Sassu <[email protected]>
Fixes: bfa3357 ("drm/ttm: allocate resource object instead of embedding it v2")
Acked-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: ChristianKoenigAMD

drivers/gpu/drm/qxl/qxl_ttm.c

@@ -127,7 +127,7 @@ static void qxl_bo_move_notify(struct ttm_buffer_object *bo,
 	struct qxl_bo *qbo;
 	struct qxl_device *qdev;
 
-	if (!qxl_ttm_bo_is_qxl_bo(bo))
+	if (!qxl_ttm_bo_is_qxl_bo(bo) || !bo->resource)
 		return;
 	qbo = to_qxl_bo(bo);
 	qdev = to_qxl(qbo->tbo.base.dev);