LU-7725 osp: get update reply from replied req

LU-7725 osp: get update reply from replied req

Only tries to retrieve update reply from replied request,
to avoid unnecessary error console message.

Signed-off-by: Di Wang <di.wang@intel.com>
Change-Id: I7b31d3e6b2a66fcce8fc77173f2a438216573f98
Reviewed-on: http://review.whamcloud.com/18232
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>