- g_return_val_if_fail (set != NULL, FALSE);
- g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
- g_return_val_if_fail (compare_set != NULL, FALSE);
- g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), FALSE);
+ g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
+ g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);