Merge tag 'dm-4.2-fixes-4' of git://

Pull device mapper fixes from Mike Snitzer:

 - stable fix for a dm_merge_bvec() regression on 32 bit Fedora systems.

 - fix for a 4.2 DM thinp discard regression due to inability to
   properly delete a range of blocks in a data mapping btree.

* tag 'dm-4.2-fixes-4' of git://
  dm btree remove: fix bug in remove_one()
  dm: fix dm_merge_bvec regression on 32 bit systems