[coreboot] Patch merged into coreboot/master: ed54c4c cbfstool: signed vs. unsigned fixes

the following patch was just integrated into master:
commit ed54c4c0ea2be438d3c94478525001ab55581f5f
Author: Mathias Krause 
Date:   Tue Jul 17 21:17:15 2012 +0200

cbfstool: signed vs. unsigned fixes

Use the right data types to fix compiler warnings.

Change-Id: Id23739421ba9e4a35599355fac9a17300ae4bda9
    Signed-off-by: Mathias Krause

Build-Tested: build bot (Jenkins) at Tue Jul 17 22:07:23 2012, giving +1
Reviewed-By: Stefan Reinauer  at Tue Jul 17 21:33:42 2012, giving +2
See http://review.coreboot.org/1236 for details.

-gerrit