[pygobject] Fix memory leak in gio.File.query_info_async()

[Paul Pogonyshev <paulp src gnome org>]

commit 47389217d1a65a8e3f404d486c508cf5d3164756
Author: Paul Pogonyshev <pogonyshev gmx net>
Date:   Thu Apr 30 22:47:19 2009 +0300

    Fix memory leak in gio.File.query_info_async()
    
    After the recent patch it would leak exception data if old argument
    order was used.  Properly decref the objects.
---
 gio/gfile.override |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/gio/gfile.override b/gio/gfile.override
index 7f369c5..e7844e3 100644
--- a/gio/gfile.override
+++ b/gio/gfile.override
@@ -1056,6 +1056,10 @@ _wrap_g_file_query_info_async(PyGObject *self, PyObject *args, PyObject *kwargs)
             PyErr_Restore(exc_type, exc_value, exc_traceback);
             goto error;
         }
+
+        Py_XDECREF(exc_type);
+        Py_XDECREF(exc_value);
+        Py_XDECREF(exc_traceback);
     }
 
     if (!pygio_notify_callback_is_valid(notify))