LU-8327 ldiskfs: release bh in make_indexed_dir

LU-8327 ldiskfs: release bh in make_indexed_dir

RHEL7.2 ext4 code leak to release bh in make_indexed_dir.
It was cause by upstream 6050d47adcadbb53582434d919ed7f038d936712

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: Ie27225cfbfb2e43f1ee48799a9836f873fefacc9
Reviewed-on: http://review.whamcloud.com/22738
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>