only set thisp if it isn't set yet
only set thisp if it isn't set yet

Stupid workaround for super, which sets the this object itself

freedesktop-unofficial-mirror/swfdec__swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,mltframework/swfdec,freedesktop-unofficial-mirror/swfdec__swfdec,mltframework/swfdec