drm/ttm: move initializing ttm->sg into ttm_tt_init_fields

Better to set this with all other fields as well.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_tt.c

@@ -77,9 +77,6 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
 	if (unlikely(bo->ttm == NULL))
 		return -ENOMEM;
 
-	if (bo->type == ttm_bo_type_sg)
-		bo->ttm->sg = bo->sg;
-
 	return 0;
 }
 
@@ -245,6 +242,7 @@ void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
 	ttm->page_flags = page_flags;
 	ttm->state = tt_unpopulated;
 	ttm->swap_storage = NULL;
+	ttm->sg = bo->sg;
 }
 
 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,