[An extra null pointer check is not needed](http://pubs.opengroup.org/onlinepubs/9699919799/functions/free.html) in functions like the following. - [File](https://github.com/falltergeist/libfalltergeist/blob/e4213c7942dea78bf790c0f05bfe5f7f09e5a17d/src/Acm/File.cpp#L56) - [SubbandDecoder](https://github.com/falltergeist/libfalltergeist/blob/5019eb5e2dcb22e75d37707e4c37b5eb294ab9bd/src/Acm/Decoder.cpp#L243) - [ValueUnpacker](https://github.com/falltergeist/libfalltergeist/blob/e4213c7942dea78bf790c0f05bfe5f7f09e5a17d/src/Acm/Unpacker.cpp#L557)
