Close the tun fd when closing the device

This patch was part of the android development, as this is not specific to android, here is an independent patch.

We also need to listen to the stop signal in the read tun function to avoid reading a close tun device.

---
 src/device.go |  1 +
 src/send.go   | 77 ++++++++++++++++++++++++++++++++---------------------------
 2 files changed, 43 insertions(+), 35 deletions(-)

index 61c87bc..8567a36 100644
@@ -205,6 +205,7 @@ func (device *Device) Close() {
 	device.RemoveAllPeers()
 	close(device.signal.stop)
 	closeUDPConn(device)
+	device.tun.device.Close()
 }
 
 func (device *Device) WaitChannel() chan struct{} {

2.15.0

You forgot to attach the patch.. :)

Cheers,
Georg

Sorry for the noise! :x