Fix a crash in swfdec_sprite_movie_swapDepths when called with no arguments
Fix a crash in swfdec_sprite_movie_swapDepths when called with no arguments

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