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2021-12-09T19:01:56.831216Z
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V 428
ipfilter: Avoid more null if-then-else blocks

As in 73db3b64f167, when WITHOUT_INET6 is selected, null if-then-else
blocks are generated because #if statements are incorrectly placed.
Moving the #if statements reduces unnecessary runtime comparisons or
compiler optimizations.

(cherry picked from commit 130df64793d7d3c680c0f7177a707867a8a19665)

Git Hash:   8ead3044eb026498d72ba862a44d99453f69071e
Git Author: cy@FreeBSD.org
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