Patch merged into coreboot/master: 74cc92c Don't try to compute I/O for empty sub buses.

the following patch was just integrated into master:
commit 74cc92c58451be4592219e5e70b894484a1f761e
Author: Stefan Reinauer 
Date:   Wed May 11 15:57:07 2011 -0700

Don't try to compute I/O for empty sub buses.

I am not sure if the sub bus being 0 is a problem, or if the assumption
    there has to be at least one non empty link is just wrong. It certainly
    does not hurt to add a small consistency check in either case.

Change-Id: I098446deef96a8baae26a7ca1ddd96e626a06dc5
    Signed-off-by: Stefan Reinauer

Build-Tested: build bot (Jenkins) at Fri Mar  9 09:00:47 2012, giving +1
See http://review.coreboot.org/693 for details.

-gerrit