LU-8634 quota: fix return code of intent quota lock

LU-8634 quota: fix return code of intent quota lock

Intent quota operation should return error code in lock_policy_res2
like other intent operations, otherwise, it'll be confused with the
error code returned by intent locking.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: I99fd04f72eeb6d10380ebd30da928b5749e74443
Reviewed-on: http://review.whamcloud.com/22751
Reviewed-by: Fan Yong <fan.yong@intel.com>
Tested-by: Jenkins
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>