LU-4826 lmv: Ensure lmv_intent_lookup cleans up reqp

LU-4826 lmv: Ensure lmv_intent_lookup cleans up reqp

Ensure there aren't invalid pointers hanging around after
ptlrpc_req_finished is called.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: Ieb16e70958d899a2d9320491dfd6276143accc55
Reviewed-on: http://review.whamcloud.com/9841
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>