[gtk] (2 commits) Non-fast-forward update to branch wip/sadiq/fixes

[Mohammed Sadiq <pksadiq src gnome org>]

The branch 'wip/sadiq/fixes' 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:

  3e9838e... flowbox: Do nothing if same model is set twice
  b0994ee... listbox: Do nothing if same model is set twice

Commits added to the branch:

  7ddad8a... examples: Remove unused variables (*)
  ee4edf9... video: Fix memory leak

(*) This commit already existed in another branch; no separate mail sent