irq_release
int irq_release(int, irqhandler_t *);
if (irq_release(ih->ih_num, ih) == 0) {
if (irq_release(ih->ih_num, ih) == 0) {
int irq_release(int, irqhandler_t *);
if (irq_release(ih->ih_num, ih) == 0) {