[pygobject] Fix GCallback Python wrapper leak

[Simon Feltman <sfeltman src gnome org>]

commit 74dfec27c6008968cc66a13792dfb02b29c231b6
Author: Simon Feltman <sfeltman src gnome org>
Date:   Fri Aug 8 02:33:51 2014 -0700

    Fix GCallback Python wrapper leak
    
    The PyObject wrapper for GCallbacks was not calling tp_free in the custom
    tp_dealloc class method.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=695130

 gi/pygi-ccallback.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gi/pygi-ccallback.c b/gi/pygi-ccallback.c
index f28487f..98dd773 100644
--- a/gi/pygi-ccallback.c
+++ b/gi/pygi-ccallback.c
@@ -82,6 +82,8 @@ _ccallback_dealloc (PyGICCallback *self)
     if (self->cache != NULL) {
         pygi_callable_cache_free ( (PyGICallableCache *)self->cache);
     }
+
+    Py_TYPE ((PyGObject *)self)->tp_free ((PyObject *)self);
 }
 
 void