fix a bug that pic_apply faults when cfunc proc is given in DEBUG mode
fix a bug that pic_apply faults when cfunc proc is given in DEBUG mode

omasanori/picrin,dcurrie/picrin,leavesbnw/picrin,koba-e964/picrin,picrin-scheme/picrin,koba-e964/picrin,picrin-scheme/picrin,ktakashi/picrin,leavesbnw/picrin,leavesbnw/picrin,ktakashi/picrin,ktakashi/picrin,dcurrie/picrin,koba-e964/picrin,omasanori/picrin