p2p/nat: fix #2291, NAT discovery did't abort on failure
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@ -139,6 +139,7 @@ func discoverUPnP() Interface {
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func discover(out chan<- *upnp, target string, matcher func(*goupnp.RootDevice, goupnp.ServiceClient) *upnp) {
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devs, err := goupnp.DiscoverDevices(target)
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if err != nil {
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out <- nil
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return
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}
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found := false
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