Thanks for the patch Stefan, it has been committed.
--Rich
commit f1dce456c594a784afb723d1bc7c09056ab3d9d9
Author: Stefan Behrens <sbehrens at giantdisaster.de>
Date: Fri Aug 23 13:07:10 2013 +0000
xfstests: don't remove the two first devices from SCRATCH_DEV_POOL