Let's reuse accept_link_local_reverse_lookups() at one more place, where we check for the list of link local reverase address domains. Since we don't actually accept the domains here (but rather the opposite, not accept), let's rename the function a bit more generically with accept_ → match_. While we are at it invert the if branches, to make things more easily understandable: filter out the unwatnted stuff and have the "all good" state as main codepath.
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