[Modify] Polish it
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		@@ -190,7 +190,11 @@ namespace WebSocketSharp.Net
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    {
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					    {
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      lock (((ICollection) _addressToEndpoints).SyncRoot) {
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					      lock (((ICollection) _addressToEndpoints).SyncRoot) {
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        var addr = listener.Address;
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					        var addr = listener.Address;
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        var endpoints = _addressToEndpoints[addr];
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					        Dictionary<int, EndPointListener> endpoints;
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					        if (!_addressToEndpoints.TryGetValue (addr, out endpoints))
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					          return;
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        endpoints.Remove (listener.Port);
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					        endpoints.Remove (listener.Port);
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        if (endpoints.Count == 0)
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					        if (endpoints.Count == 0)
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          _addressToEndpoints.Remove (addr);
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					          _addressToEndpoints.Remove (addr);
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