do not close a new subscription message right after it's creation

Author: vborioni-onit

src/NetMQ/Core/Transports/StreamEngine.cs

@@ -1138,7 +1138,6 @@ PushMsgResult ProcessRoutingIdMsg (ref Msg msg)
             if (m_subscriptionRequired)
             {
                 Msg subscription = new Msg();
-                subscription.Close();
                 subscription.InitPool(1);
                 subscription.Put((byte)1);