Wrong stream being closed ?

[OndrejMicina]

Hello,
I am just going trough the SimpleTcpClient.cs, especially methods Connect() and ConnectWithRetries(). In part where we are registering callback for cancelation token, I can not understand why we are closing _sslStream in the condition (!_ssl). Any explanation, why it is like this, is welcomed, thank you.

_token.Register(() =>
{
    if (!_ssl)
    {
        if (_sslStream == null) return;
        _sslStream.Close();
    }
    else
    {
        if (_networkStream == null) return;
        _networkStream.Close();
    }
});