release channel ids before notifiying outstanding rpc calls

Author: Tim Watson

src/com/rabbitmq/client/impl/ChannelN.java

@@ -480,10 +480,10 @@ private void asyncShutdown(Command command) throws IOException {
                 processShutdownSignal(signal, true, false);
                 quiescingTransmit(new Channel.CloseOk());
             } finally {
+                releaseChannel();
                 notifyOutstandingRpc(signal);
             }
         }
-        releaseChannel();
         notifyListeners();
     }