tunnel deletion on shutdown fix

srt/tunnel.go

@@ -24,6 +24,11 @@ func (tunnel *Tunnel) Start() {
 	// central tunnel loop, read incoming, process and generate response
 	// write response if any
 	for {
+		// force check since no new packets after shutdown
+		if tunnel.state.state == 3 {
+			tunnel.broken = true
+			break
+		}
 		packet, err := tunnel.ReadPacket()
 		if err != nil {
 			fmt.Println(err)