[PATCH] x86-64: Use constant instead of raw number in x86_64 ioperm.c

This is a tiny cleanup to increase readability

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>