[libgnome-volume-control] (3 commits) Non-fast-forward update to branch wip/muktupavels/warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

The branch 'wip/muktupavels/warnings' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  991de6f... test-audio-device-selection: fix -Wsign-compare warning
  183e298... test-audio-device-selection: fix -Wdiscarded-qualifiers war
  d2bb092... mixer-control: fix -Wsign-compare warnings

Commits added to the branch:

  14bc458... test-audio-device-selection: fix -Wsign-compare warning
  cbf4888... test-audio-device-selection: fix -Wdiscarded-qualifiers war
  fb03e0f... mixer-control: fix -Wsign-compare warnings