The commit d000de8f062ce070d5310f164ebf4f5ed26fcad0 included a
compilation warning that makes sense when Parted is built without
debugging. To solve the warning and ensure that when running without
debugging we return a sinsible value I've reverted d000de8f062ce070d5310f164ebf4f5ed26fcad0 change and added a nice
comment to avoid misunderstandings again.