Lift the call to __begin_transaction out of __write_initial_superblock in
dm-thin-metadata.  Called higher up the call chain now.
Signed-off-by: NJoe Thornber <ejt@redhat.com>
Signed-off-by: NMike Snitzer <snitzer@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>