Fix unhandled case CDROM_AUDIO_INVALID
When using the CDROMSUBCHNL ioctl, the code does not handle the
CDROM_AUDIO_INVALID audiostatus value. As a result, it thinks the disc is
playing, and so you cannot select any other track than the current track.
Origin: Tom Kelly ( tjk55 ) - 2010-11-08 22:13:22 UTC
http://sourceforge.net/tracker/?func=detail&aid=
3105579&group_id=3714&atid=303714