drm/amdgpu: unbind GTT only when it is bound

Doesn't make much sense to clear the GTT when it was never filled.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-09-09 15:39:08 +02:00 • committed by Alex Deucher
commit 78ab0a38bf