[gtk+/gtk-2-24] ComboBox: Add missing disconnect in menu_destroy()

[Daniel Boles <dboles src gnome org>]

commit e0e2107f356b3b512aea0fe1ad08d0c345ec58bd
Author: Daniel Boles <dboles src gnome org>
Date:   Fri Sep 1 15:03:45 2017 +0100

    ComboBox: Add missing disconnect in menu_destroy()
    
    We were not disconnecting the signals from the menu (popup_widget), so
    they were leaked when e.g. the mode was changed or the CB was destroyed.

 gtk/gtkcombobox.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index 58a9682..02ca5e8 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -3186,10 +3186,8 @@ gtk_combo_box_menu_destroy (GtkComboBox *combo_box)
 {
   GtkComboBoxPrivate *priv = combo_box->priv;
 
-  g_signal_handlers_disconnect_by_func (priv->button,
-                                        gtk_combo_box_menu_button_press, combo_box);
-  g_signal_handlers_disconnect_by_func (priv->button,
-                                        gtk_combo_box_button_state_changed, combo_box);
+  g_signal_handlers_disconnect_by_data (priv->button, combo_box);
+  g_signal_handlers_disconnect_by_data (priv->popup_widget, combo_box);
 
   /* unparent will remove our latest ref */
   gtk_widget_unparent (priv->button);