drm/amdgpu: fix old fence check in amdgpu_fence_emit

We don't hold a reference to the old fence, so it can go away
any time we are waiting for it to signal.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2019-03-29 19:30:23 +01:00 • committed by Alex Deucher
commit 3d2aca8c86