[gtk+] Avoid a compiler warning

[Matthias Clasen <matthiasc src gnome org>]

commit c636b21aec3daffbbdc844d889cf4af92b0f5120
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Aug 1 10:55:18 2013 +0200

    Avoid a compiler warning

 demos/gtk-demo/infobar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/demos/gtk-demo/infobar.c b/demos/gtk-demo/infobar.c
index 2239bbe..402a40b 100644
--- a/demos/gtk-demo/infobar.c
+++ b/demos/gtk-demo/infobar.c
@@ -17,7 +17,7 @@ on_bar_response (GtkInfoBar *info_bar,
 
   if (response_id == GTK_RESPONSE_CLOSE)
     {
-      gtk_widget_hide (info_bar);
+      gtk_widget_hide (GTK_WIDGET (info_bar));
       return;
     }