[gtk/fix-layout-parser-leak] Don't leak layout parser data

[Matthias Clasen <matthiasc src gnome org>]

commit 1b3359cc69b2b5d32e2c31871d8155b28fe25c73
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 14 13:27:49 2019 -0400

    Don't leak layout parser data
    
    Reported in https://gitlab.gnome.org/GNOME/gtk/issues/2022

 gtk/gtkwidget.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index f36a9f0f3d..b927ef935a 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -10107,6 +10107,7 @@ gtk_widget_buildable_finish_layout_properties (GtkWidget *widget,
     }
 
   g_slist_free_full (layout_properties, layout_property_info_free);
+  g_slice_free (LayoutParserData, layout_data);
 }
 
 static void