Fix memory leak in gio.File.query_info_async()
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.

GNOME/pygio,nzjrs/pygio,GNOME/pygio,GNOME/pygio,nzjrs/pygio,nzjrs/pygio