Don't return immediately in swfdec_loader_target_parse if the loader is in error
Don't return immediately in swfdec_loader_target_parse if the loader is in error

Also update the hack for native FLV loading to call swfdec_loader_target_parse
when the loader changed instead of just cninuing. This allows different parse
functions in different targets.

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