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Prevent forks of release branches from triggering CI/CD when pushed. All work in forks should be done in a non-release branch

Fix provided by grapvar@gmail.com

`rc` collects exit status all the way down but is not used at all? If `code`
comparison at exit is intended then there exists some path that leaves it in
garbage value, say when `ldap_whoami` or `ldap_cancel` fails.

Tighten validity checks