drm/amdgpu: free the metadata buffer for sg type BOs as well

Since both sg and device type BOs have metadata buffer, free
the buffer in both cases when to destroy BOs
Signed-off-by: NShiwu Zhang <shiwu.zhang@amd.com>
Acked-by: NNirmoy Das <Nirmoy.das@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -71,7 +71,7 @@ static void amdgpu_bo_destroy(struct ttm_buffer_object *tbo)
 	}
 	amdgpu_bo_unref(&bo->parent);
 
-	if (bo->tbo.type == ttm_bo_type_device) {
+	if (bo->tbo.type != ttm_bo_type_kernel) {
 		ubo = to_amdgpu_bo_user(bo);
 		kfree(ubo->metadata);
 	}