Fix submission of tasks in lu with pivoting

examples/lu/xlu_pivot.c

@@ -259,7 +259,7 @@ static int dw_codelet_facto_pivot(starpu_data_handle_t *dataAp,
 		{
 			ret = starpu_task_submit(task);
 			if (ret != -ENODEV) STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
-			return ret;
+			if (ret == -ENODEV) return ret;
 		}
 
 		for (i = 0; i < nblocks; i++)