[gnome-games] Fix vapi binding for games_preimage_render_cairo_sub

[Robert Ancell <rancell src gnome org>]

commit 9ff11c3f8684ac7cd414ca2e957f525f07f402fc
Author: Robert Ancell <robert ancell canonical com>
Date:   Sat Dec 31 15:44:15 2011 +1100

    Fix vapi binding for games_preimage_render_cairo_sub

 libgames-support/GnomeGamesSupport-1.0.vapi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgames-support/GnomeGamesSupport-1.0.vapi b/libgames-support/GnomeGamesSupport-1.0.vapi
index a5f71c4..b369bbb 100644
--- a/libgames-support/GnomeGamesSupport-1.0.vapi
+++ b/libgames-support/GnomeGamesSupport-1.0.vapi
@@ -230,7 +230,7 @@ namespace GnomeGamesSupport
         public Gdk.Pixbuf render (int width, int height);
         public void render_cairo (Cairo.Context cr, int width, int height);
         public Gdk.Pixbuf render_sub (string node, int width, int height, double xoffset, double yoffset, double xzoom, double yzoom);
-        public void render_cairo_sub (Cairo.Context cr, string node, int width, int height, double xoffset, double yoffset, double xzoom, double yzoom);
+        public void render_cairo_sub (Cairo.Context cr, string? node, int width, int height, double xoffset, double yoffset, double xzoom, double yzoom);
         public bool is_scalable ();
         public int get_width ();
         public int get_height ();