[mutter] clutter/stage: Switch to clutter_seat_peek_devices()

[verdre <jonasd src gnome org>]

commit 8de91f1053d3584b6cd1df513837cc7ecec67b01
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Fri May 29 22:47:00 2020 +0200

    clutter/stage: Switch to clutter_seat_peek_devices()
    
    Switch from clutter_seat_list_devices() to the new peek_devices() method
    of ClutterSeat in cases where we're only looping through the returned
    list without manipulating it. This way we don't have to unnecessarily
    copy around the list of devices.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1275

 clutter/clutter/clutter-stage.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index fd40393e2e..425980ab8a 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -1409,12 +1409,12 @@ _clutter_stage_check_updated_pointers (ClutterStage *stage)
   ClutterBackend *backend;
   ClutterSeat *seat;
   GSList *updating = NULL;
-  GList *l, *devices;
+  const GList *l, *devices;
   graphene_point_t point;
 
   backend = clutter_get_default_backend ();
   seat = clutter_backend_get_default_seat (backend);
-  devices = clutter_seat_list_devices (seat);
+  devices = clutter_seat_peek_devices (seat);
 
   for (l = devices; l; l = l->next)
     {
@@ -1454,8 +1454,6 @@ _clutter_stage_check_updated_pointers (ClutterStage *stage)
         }
     }
 
-  g_list_free (devices);
-
   return updating;
 }