[gtk+] Fix make check

[Matthias Clasen <matthiasc src gnome org>]

commit 9b6ae2e9d52459e7b737c32ff0155052d1206a77
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jan 30 20:46:44 2012 -0500

    Fix make check
    
    Several unwanted symbols have sneaked in.

 gtk/gtkaboutdialog.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkaboutdialog.c b/gtk/gtkaboutdialog.c
index c72f1ab..2a9757c 100644
--- a/gtk/gtkaboutdialog.c
+++ b/gtk/gtkaboutdialog.c
@@ -787,8 +787,8 @@ gtk_about_dialog_init (GtkAboutDialog *about)
   gtk_about_dialog_set_logo (about, NULL);
 }
 
-
-void destroy_credit_section (gpointer data)
+static void
+destroy_credit_section (gpointer data)
 {
   CreditSection *cs = data;
   g_free (cs->heading);