fix warnings

src/torrent.cpp

@@ -5731,7 +5731,7 @@ namespace libtorrent
 			return false;
 		}
 		TORRENT_ASSERT(m_connections.find(p) == m_connections.end());
-		m_connections.insert(p).first;
+		m_connections.insert(p);
 #ifdef TORRENT_DEBUG
 		error_code ec;
 		TORRENT_ASSERT(p->remote() == p->get_socket()->remote_endpoint(ec) || ec);

src/utp_socket_manager.cpp

@@ -225,8 +225,6 @@ namespace libtorrent
 			return utp_incoming_packet(m_last_socket, p, size, ep, receive_time);
 		}
 
-		socket_map_t::iterator i = m_utp_sockets.find(id);
-
 		std::pair<socket_map_t::iterator, socket_map_t::iterator> r =
 			m_utp_sockets.equal_range(id);