fix: fix quic reconnect fail

Author: ICKelin

src/gtun/proxy/tproxy_udp.go

@@ -191,16 +191,16 @@ func (p *TProxyUDP) serve(lconn *net.UDPConn) error {
 			p.udpsessLock.Unlock()
 			sess := p.routeManager.Route(p.region, dip)
 			if sess == nil {
-				// force close to trigger reconnect
-				// quic CAN'T get close state by sess.IsClose()
-				// Close to trigger quic reconnect
-				sess.Close()
 				logs.Error("no route to host: %s", dip)
 				continue
 			}
 
 			stream, err := sess.OpenStream()
 			if err != nil {
+				// force close to trigger reconnect
+				// quic CAN'T get close state by sess.IsClose()
+				// Close to trigger quic reconnect
+				sess.Close()
 				logs.Error("open stream fail: %v", err)
 				continue
 			}