[gtk/fix-gears-leak] gtk4-demo: Fix a memory leak

[Matthias Clasen <matthiasc src gnome org>]

commit 4a04e468fd38cb21c978f4667d54ba1cbcc736ca
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Aug 13 17:27:40 2022 -0400

    gtk4-demo: Fix a memory leak
    
    The gears demo was leaking its vertices.

 demos/gtk-demo/gtkgears.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/demos/gtk-demo/gtkgears.c b/demos/gtk-demo/gtkgears.c
index 44b49b8b09..400f6b1104 100644
--- a/demos/gtk-demo/gtkgears.c
+++ b/demos/gtk-demo/gtkgears.c
@@ -223,6 +223,7 @@ static void
 destroy_gear (struct gear *g)
 {
   g_free (g->strips);
+  g_free (g->vertices);
   g_free (g);
 }