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 <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220503063613.46925-1-christian.koenig@amd.com

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

@@ -631,9 +631,13 @@ static void amdgpu_vm_pt_free(struct amdgpu_vm_bo_base *entry)
 	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);
 }