fixed race condition when a torrent is removed while one of the connections is still in the connection queue

src/peer_connection.cpp

@@ -2334,7 +2334,13 @@ namespace libtorrent
 		ptime now(time_now());
 
 		boost::shared_ptr<torrent> t = m_torrent.lock();
-		TORRENT_ASSERT(t);
+		if (!t || m_disconnecting)
+		{
+			m_ses.m_half_open.done(m_connection_ticket);
+			m_connecting = false;
+			disconnect();
+			return;
+		}
 
 		on_tick();