drm/amdgpu: bo could be null when access in vm bo update

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: David Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Junwei Zhang 2018-04-23 17:21:21 +08:00 • committed by Alex Deucher
commit 8239f57ac3