Jared Baur 6706ee8419 Return RcodeServerFailure when DNS64 has no next plugin (#6590) ...

If using a coredns config with only the dns64 plugin specified, the
`Next` plugin that dns64 will attempt to call will be nil, resulting in
a nil pointer dereference. We should return an error instead of
crashing.

Signed-off-by: Jared Baur <jaredbaur@fastmail.com>

2024-04-09 09:52:43 +02:00

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