drm/amdgpu: fix NULL ptr dref in the VM code

The exclusive fence is of course perfectly optional here.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2019-02-07 11:41:59 +01:00 • committed by Alex Deucher
commit 7fbd31ccea