Got segvault on notification

[jooooonathan]

Hi,

I got a segmentation fault on line 43.

it seems the error handling has some problem :)

Version I use: v1.0.5

---

when creating a subscription to a server that previously has a session and subscriptions with another client.
but if the go-netconf client connect and create subscription first then the other client create session and subscriptions with the same server it will work fine.
I think the root cause for my case is I set the timeout too small.
But the error handling seems not process it well.

go-netconf-client/netconf/operations.go

Lines 41 to 44 in 5c73494

	rpc, err := session.SyncRPC(sub, timeout)
	if err != nil || len(rpc.Errors) != 0 {
	return fmt.Errorf("fail to create notification stream with errors: %s. Error: %s", rpc.Errors, err)
	}