Fix widget-boolean.c to free data on button destruction

src/widget-boolean.c

@@ -42,6 +42,10 @@ static void toggle_button_updated(
   toggle_button_set_text(data->button, data->text[value]);
 }
 
+static void on_destroy(struct boolean *data) {
+  g_free(data);
+}
+
 GtkWidget *make_boolean_alsa_elem(
   struct alsa_elem *elem,
   const char       *disabled_text,
@@ -78,5 +82,7 @@ GtkWidget *make_boolean_alsa_elem(
 
   toggle_button_updated(elem, data);
 
+  g_object_weak_ref(G_OBJECT(data->button), (GWeakNotify)on_destroy, data);
+
   return data->button;
 }