drm/amdgpu: fix drm-next merge fallout

That hunk somehow got missing while solving the conflict between the TTM
and AMDGPU changes for drm-next.

Signed-off-by: Christian König <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c

···
 	if (!entry->bo)
 		return;
 	shadow = amdgpu_bo_shadowed(entry->bo);
+	if (shadow) {
+		ttm_bo_set_bulk_move(&shadow->tbo, NULL);
+		amdgpu_bo_unref(&shadow);
+	}
+	ttm_bo_set_bulk_move(&entry->bo->tbo, NULL);
 	entry->bo->vm_bo = NULL;
 	list_del(&entry->vm_status);
-	amdgpu_bo_unref(&shadow);
 	amdgpu_bo_unref(&entry->bo);
 }