drm/radeon: remove unnecessary unpin

We don't pin the BO on allocation, so don't unpin it on free.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_gart.c

@@ -207,7 +207,6 @@ void radeon_gart_table_vram_free(struct radeon_device *rdev)
 	if (rdev->gart.robj == NULL) {
 		return;
 	}
-	radeon_gart_table_vram_unpin(rdev);
 	radeon_bo_unref(&rdev->gart.robj);
 }