[PATCH 000 of 2] md: Fixes for md in 2.6.23

It appears that a couple of bugs slipped in to md for 2.6.23.
These two patches fix them and are appropriate for 2.6.23.y as well
as 2.6.24-rcX

Thanks,
NeilBrown

 [PATCH 001 of 2] md: Fix an unsigned compare to allow creation of bitmaps with v1.0 metadata.
 [PATCH 002 of 2] md: raid5: fix clearing of biofill operations