[mutter] Non-fast-forward update to branch wip/tintou/clutter-xi2-device

[Corentin Noël <corentinnoel src gnome org>]

The branch 'wip/tintou/clutter-xi2-device' 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:

  e82de1a... clutter-input-device-xi2: Initialize group_modes in all cas

Commits added to the branch:

  2a45b7d... clutter-input-device-xi2: Check for null group_modes before