Deal with duplicates correctly rather than randomly fail.

BUG=None
TEST=manual run of --board=x86-generic

Change-Id: Ie9590b5d7b4d92eaa518ae4a13ecea3de848a04f
Reviewed-on: http://gerrit.chromium.org/gerrit/7476
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
2 files changed