ReplicatedPG.cc: 	_scrub must set head when it encounters a head snap 	curclone counts down, not up
ReplicatedPG.cc:
	_scrub must set head when it encounters a head snap
	curclone counts down, not up

Signed-off-by: Samuel Just <080670f7d9c6f3eb64055fc3fc7c93ba2c444c40@hq.newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph