tun/netstack: ensure (*netTun).incomingPacket chan is closed

Without this, `device.Close()` will deadlock.

Signed-off-by: Colin Adler <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>

Author: coadler

tun/netstack/tun.go

@@ -164,6 +164,10 @@ func (tun *netTun) Close() error {
 
 	tun.ep.Close()
 
+	if tun.incomingPacket != nil {
+		close(tun.incomingPacket)
+	}
+
 	return nil
 }