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Bug #1262819 - bonjour unregistration fails in wireless device
Fix unnecessary error popup during shutdown if the wireless device driver is running and mdns de-registration fails. Fixes #1262819 [Calibre throws error when stopping wireless device connection](https://bugs.launchpad.net/calibre/+bug/1262819)

Merge branch 'master' of https://github.com/cbhaley/calibre