Adjust indents [ci skip]

variable.c

@@ -1581,7 +1581,7 @@ iterate_over_shapes_with_callback(rb_shape_t *shape, rb_ivar_foreach_callback_fu
       case SHAPE_IVAR:
         iterate_over_shapes_with_callback(rb_shape_get_shape_by_id(shape->parent_id), callback, itr_data);
         VALUE * iv_list;
-        switch(BUILTIN_TYPE(itr_data->obj)) {
+        switch (BUILTIN_TYPE(itr_data->obj)) {
           case T_OBJECT:
             iv_list = ROBJECT_IVPTR(itr_data->obj);
             break;