drm/ttm: init locked again to prevent incorrect unlock

Signed-off-by: NRoger He <Hongbo.He@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_bo.c

@@ -737,6 +737,7 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
 								      place)) {
 				if (locked)
 					reservation_object_unlock(bo->resv);
+				locked = false;
 				continue;
 			}
 			break;