lib/mmapped nit: avoid a warning
https://gitlab.nic.cz/knot/knot-resolver/-/jobs/1660161#L80
If you wonder about the exclamation mark, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425#c34
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https://gitlab.nic.cz/knot/knot-resolver/-/jobs/1660161#L80
If you wonder about the exclamation mark, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425#c34