Remove dead assignments (thanks to Ville Skyttä for the clang-analyzer report)
Fix memory leak (thanks to Ville Skyttä for the clang-analyzer report)
Fix incorrect parsing of audio_channels attribute (thanks to Ville Skyttä for the clang-analyzer report)
Clarify that vob number arg can never be native (thanks to Ville Skyttä for the clang-analyzer report)
Fix potential dereferencing of null pointers (thanks to Ville Skyttä for the clang-analyzer report)
fix indentation