Fix leaking connection if Listener.Close() is called before connect() #1228
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It could leak connections if Listener.Close() was called before Listener.connect(), because connect() would create a connection and *then* hold the lock and set l.cn. Fixes #1192
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It could leak connections if Listener.Close() was called before Listener.connect(), because connect() would create a connection and then hold the lock and set l.cn.
Fixes #1192