Memory leak in AgentPath::ReorderCompositeNH func

Memory is allocated for NHkey to check if mpls points to same
NH as in key list. Memory will now be freed after its use.

Change-Id: I03d542a3b4b1086ac52974615901bc4db480bc09
Closes-bug: #1615147

src/vnsw/agent/oper/agent_path.cc

@@ -1304,9 +1304,8 @@ bool AgentPath::ReorderCompositeNH(Agent *agent,
          //some other purpose. If it is so then ignore the request and wait for
          //another update.
          const NextHopKey *nh_key_1 = component_nh_key->nh_key();
-         const NextHopKey *nh_key_2 =
-             static_cast<const NextHopKey*>(mpls->nexthop()->
-                                      GetDBRequestKey().release());
+         DBEntryBase::KeyPtr key = mpls->nexthop()->GetDBRequestKey();
+         const NextHopKey *nh_key_2 = static_cast<const NextHopKey*>(key.get());
          if (nh_key_1->IsEqual(*nh_key_2) == false) {
              return false;
          }