Fix the superio irq discovery heuristic to work on systems where there is an empty slot before the ioc card (such as on Fuel).
Fix the superio irq discovery heuristic to work on systems where there is
an empty slot before the ioc card (such as on Fuel).

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars