[gtk+] button: fix variable name in function declaration

[Cosimo Cecchi <cosimoc src gnome org>]

commit 385a2398cecf073606abae89e351e5fb0e7f640c
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon May 21 17:26:43 2012 -0400

    button: fix variable name in function declaration
    
    Or gtk-doc/introspection scanners will complain.

 gtk/gtkbutton.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkbutton.h b/gtk/gtkbutton.h
index 96f5000..e97ad5f 100644
--- a/gtk/gtkbutton.h
+++ b/gtk/gtkbutton.h
@@ -118,7 +118,7 @@ void                  gtk_button_set_image_position (GtkButton      *button,
 GtkPositionType       gtk_button_get_image_position (GtkButton      *button);
 void                  gtk_button_set_always_show_image (GtkButton   *button,
                                                         gboolean     always_show);
-gboolean              gtk_button_get_always_show_image (GtkButton   *image_menu_item);
+gboolean              gtk_button_get_always_show_image (GtkButton   *button);
 
 GdkWindow*            gtk_button_get_event_window   (GtkButton      *button);