x86: make io_apic not connected pin print complete

Normally we will have two segment not connected pin pin0, and pin after
15...

So we need to print out "not connected\n" for previous segment, before
printing out connected pins info...

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>