This is updated cleanup patch against 2.5.30 (+ David's and Kimi's patch).

1) reformatted the source according to the recommendation,
2) fixed remaining iosapic_register_irq -> iosapic_register_intr in acpi.c
3) updated iosapic.c comment
4) made irq variables from int to unsigned int in iosapic.c, irq.c

While I'm looking at set_irq_affinity_info() in irq.c,
I found parse_hex_value is defined to return unsigned int while
it returns -EFAULT. 4) includes a fix for this.