staging: lustre: fix failure handle of create reply

error handler of lnet_create_reply_msg() didn't release lnet_res_lock
if lnet_msg_alloc() failed.
It can be fixed by moving validation check of msg out from lock.
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2745
Reviewed-on: http://review.whamcloud.com/5542Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Isaac Huang <he.huang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/lnet/lib-move.c

@@ -2187,17 +2187,17 @@ lnet_create_reply_msg(lnet_ni_t *ni, lnet_msg_t *getmsg)
 	LASSERT(!getmsg->msg_target_is_router);
 	LASSERT(!getmsg->msg_routing);
 
-	cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
-	lnet_res_lock(cpt);
-
-	LASSERT(getmd->md_refcount > 0);
-
 	if (!msg) {
 		CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
 		       libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
 		goto drop;
 	}
 
+	cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
+	lnet_res_lock(cpt);
+
+	LASSERT(getmd->md_refcount > 0);
+
 	if (!getmd->md_threshold) {
 		CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
 		       libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),