Fix a bug in the 'redirect' mechanism.

[Spiral90210]

A non nil error would cause a PermError to be returned instead of executing the test.

[Spiral90210]

Hey, I was working on a personal feature to be able to generate an allow list of networks from an SPF record for later use rather than execute a check 'here and now' against a single ip and noticed the redirect spf test would not be executed. Let me know if you'd be interested in that code when it's done - it cannot support PTR mechanisms as that requires an IP at run time which might be an issue but they're depricated anyway and I know I won't need them so I'm good anyway! 😆