LU-5367 mdt: handle failed PDO lock in mdt_object_local_lock()

LU-5367 mdt: handle failed PDO lock in mdt_object_local_lock()

In mdt_object_local_lock() call mdt_object_unlock() if mdt_fid_lock()
fails on the PDO lock. This is needed because ldlm_cli_enqueue_local()
may initialize the passed in lock handle and then fail later.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I17a01d569a77a86f8ce72a1617f0cb8ed500985b
Reviewed-on: http://review.whamcloud.com/11219
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>