[pygtk] Reference the surface in GtkPrintJob.get_surface

[John Stowers <jstowers src gnome org>]

commit 828f3c430e535fae6e55a8e49ca0c7087b560ac2
Author: Mathias Doreille <doreille smr ch>
Date:   Fri Dec 24 09:58:30 2010 +1300

    Reference the surface in GtkPrintJob.get_surface
    
    	* Fixes bug 532322

 gtk/gtkunixprint.override |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkunixprint.override b/gtk/gtkunixprint.override
index d984c95..05ac8c7 100644
--- a/gtk/gtkunixprint.override
+++ b/gtk/gtkunixprint.override
@@ -103,9 +103,9 @@ _wrap_gtk_print_job_get_surface(PyGObject *self)
         return NULL;
 
 #if PYCAIRO_VERSION_HEX >= 0x1010600
-    return PycairoSurface_FromSurface(surface, NULL);
+    return PycairoSurface_FromSurface(cairo_surface_reference(surface), NULL);
 #else
-    return PycairoSurface_FromSurface(surface, NULL, NULL);
+    return PycairoSurface_FromSurface(cairo_surface_reference(surface), NULL, NULL);
 #endif
 }
 %%