[pygtk] Fix leaks of Pango objects

[Federico Mena Quintero <federico src gnome org>]

commit eca72baa5616fbe4dbebea43c7e5940847dc5ab8
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Tue Sep 27 00:17:52 2011 -0400

    Fix leaks of Pango objects
    
    Gtk.PrintContext.create_pango_context()
    Gtk.PrintContext.create_pango_layout()
    pangocairo.CairoContext.create_layout()
    
    were leaking the objects they returned.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=660216

 gtk/gtk-2.10.defs   |    2 ++
 pangocairo.override |   11 ++++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtk-2.10.defs b/gtk/gtk-2.10.defs
index 69c7e0c..faa45e1 100644
--- a/gtk/gtk-2.10.defs
+++ b/gtk/gtk-2.10.defs
@@ -1388,12 +1388,14 @@
 (define-method create_pango_context
   (of-object "GtkPrintContext")
   (c-name "gtk_print_context_create_pango_context")
+  (caller-owns-return #t)
   (return-type "PangoContext*")
 )
 
 (define-method create_pango_layout
   (of-object "GtkPrintContext")
   (c-name "gtk_print_context_create_pango_layout")
+  (caller-owns-return #t)
   (return-type "PangoLayout*")
 )
 
diff --git a/pangocairo.override b/pangocairo.override
index bb923e6..5101107 100644
--- a/pangocairo.override
+++ b/pangocairo.override
@@ -118,11 +118,16 @@ _wrap_pango_cairo_update_context(PyGObject *self, PyObject *args, PyObject *kwar
 static PyObject *
 _wrap_pango_cairo_create_layout(PyGObject *self)
 {
-    PangoLayout *ret;
+    PangoLayout *layout;
+    PyObject *ret;
 
-    ret = pango_cairo_create_layout(PycairoContext_GET(self));
+    layout = pango_cairo_create_layout(PycairoContext_GET(self));
     /* pygobject_new handles NULL checking */
-    return pygobject_new((GObject *)ret);
+    ret = pygobject_new((GObject *)layout);
+    if (layout)
+       g_object_unref(layout);
+
+    return ret;
 }
 
 static PyObject *