[pygobject] [gtk-demo] appwindow.py: fix callback signatures

[Dieter Verfaillie <dieterv src gnome org>]

commit 62fda288c1c37167c589e8e9d49ed625f770a98a
Author: Dieter Verfaillie <dieterv optionexplicit be>
Date:   Mon Aug 22 07:57:31 2011 +0200

    [gtk-demo] appwindow.py: fix callback signatures

 demos/gtk-demo/demos/appwindow.py |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/demos/gtk-demo/demos/appwindow.py b/demos/gtk-demo/demos/appwindow.py
index 2135e7a..1ab7c51 100644
--- a/demos/gtk-demo/demos/appwindow.py
+++ b/demos/gtk-demo/demos/appwindow.py
@@ -39,7 +39,7 @@ global _demoapp
 def widget_destroy(widget, button):
     widget.destroy()
 
-def activate_action(action, user_data):
+def activate_action(action, user_data=None):
     global window
 
     name = action.get_name()
@@ -60,7 +60,7 @@ def activate_action(action, user_data):
     dialog.connect('response', widget_destroy)
     dialog.show()
 
-def activate_radio_action(action, current, user_data):
+def activate_radio_action(action, current, user_data=None):
     global infobar
     global messagelabel
 
@@ -88,7 +88,7 @@ def update_statusbar(buffer, statusbar):
 def mark_set_callback(buffer, new_location, mark, data):
     update_statusbar(buffer, data)
 
-def about_cb(widget, data):
+def about_cb(widget, user_data=None):
     global window
 
     authors = ['John (J5) Palmieri',