[mutter] clutter/gesture-action: Fix a fallthrough warning

[Marge Bot <marge-bot src gnome org>]

commit ab21bedcfc04830eb416492cf6b34d5bca6c1ff4
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Mar 4 20:50:12 2022 +0100

    clutter/gesture-action: Fix a fallthrough warning
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2319>

 clutter/clutter/clutter-gesture-action.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/clutter/clutter/clutter-gesture-action.c b/clutter/clutter/clutter-gesture-action.c
index 5ff9754953..a57faa74be 100644
--- a/clutter/clutter/clutter-gesture-action.c
+++ b/clutter/clutter/clutter-gesture-action.c
@@ -417,7 +417,7 @@ clutter_gesture_action_handle_event (ClutterAction      *action,
             return CLUTTER_EVENT_PROPAGATE;
           }
       }
-      /* Follow same code path as a touch event update */
+      G_GNUC_FALLTHROUGH;
 
     case CLUTTER_TOUCH_UPDATE:
       if (!priv->in_gesture)