- If resource which was allocated for pcic was
requested via this ioctl, bus_alloc_resource
would be succeeded and that resource was
returned as free resource. So check whether
requested resource was used for pcic or not
before bus_alloc_resource test.
- merge SYS_RES_IRQ routine into other SYS_RES_*
routine and clean up.
problem reported by: Yohei Terada <terada@jiro.c.u-tokyo.ac.jp>