[gtk/fix-cell-accessible-leak] Fix a leak of cell accessibles

[Matthias Clasen <matthiasc src gnome org>]

commit cc977be580b9a7c2683810fe36fe485ee8583ec0
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Feb 11 18:39:55 2022 -0500

    Fix a leak of cell accessibles
    
    gtk_container_cell_accessible_add_child is transfer none,
    so we need to drop the reference we hold, otherwise it
    leaks.

 gtk/a11y/gtktreeviewaccessible.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/a11y/gtktreeviewaccessible.c b/gtk/a11y/gtktreeviewaccessible.c
index c1a2097a1e..c2b7e8add0 100644
--- a/gtk/a11y/gtktreeviewaccessible.c
+++ b/gtk/a11y/gtktreeviewaccessible.c
@@ -413,6 +413,7 @@ create_cell_accessible (GtkTreeView           *treeview,
         {
           cell = create_cell_accessible_for_renderer (l->data, GTK_WIDGET (treeview), ATK_OBJECT 
(container));
           gtk_container_cell_accessible_add_child (container, cell);
+          g_object_unref (cell);
         }
 
       cell = GTK_CELL_ACCESSIBLE (container);