fixed upnp bug when connecting without network

include/libtorrent/upnp.hpp

@@ -75,6 +75,7 @@ public:
 	// it will not be mapped
 	void set_mappings(int tcp, int udp);
 
+	void discover_device();
 	void close();
 
 	std::string router_model() { return m_model; }
@@ -91,7 +92,6 @@ private:
 	void resend_request(asio::error_code const& e);
 	void on_reply(udp::endpoint const& from, char* buffer
 		, std::size_t bytes_transferred);
-	void discover_device();
 
 	struct rootdevice;
 	

src/session_impl.cpp

@@ -2349,6 +2349,7 @@ namespace detail
 			, bind(&session_impl::on_port_mapping
 				, this, _1, _2, _3));
 
+		m_upnp->discover_device();
 		m_upnp->set_mappings(m_listen_interface.port(), 
 #ifndef TORRENT_DISABLE_DHT
 			m_dht ? m_dht_settings.service_port : 

src/upnp.cpp

@@ -81,7 +81,6 @@ upnp::upnp(io_service& ios, connection_queue& cc
 	m_log.open("upnp.log", std::ios::in | std::ios::out | std::ios::trunc);
 #endif
 	m_retry_count = 0;
-	discover_device();
 }
 
 upnp::~upnp()