Refactor: libcrmcommon: Convert bzlib RCs unconditionally

Not something I agree with (I'd prefer to check the return codes
directly as the bzip2 documentation specifies); but discussed in
https://github.com/ClusterLabs/pacemaker/pull/3361#discussion_r1490117091

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>