LU-5727 ldlm: revert changes to ldlm_cancel_aged_policy()

LU-5727 ldlm: revert changes to ldlm_cancel_aged_policy()

The changes to ldlm_cancel_aged_policy() intrdouced from LU-4300
(bfae5a) was incorrect. This patch revert this part of changes.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Change-Id: Ic04f894c8bf54dbbdfb0e3bada5f6e4a367711a5
Reviewed-on: http://review.whamcloud.com/12448
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>