[Merge] lp:~phablet-team/media-hub/fix-1457129 into lp:media-hub

[Thomas Voß]

Review: Needs Fixing

Please use a std::unique_lock instead of manually try-locking/unlocking the mutex. Would look like:

  std::unique_lock<std::mutex> ul{system_state_cookie_store_guard, std::try_to_lock};
  if (ul.owns_lock())
  {
    // do stuff.
  }

With that, the mutex is always unlocked, even in the case of exceptions.
  
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https://code.launchpad.net/~phablet-team/media-hub/fix-1457129/+merge/260343
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