[Bug 285870] Bug in atexit code in rare specific case + patch to correct it

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285870

--- Comment #13 from Kyle Evans <kevans@freebsd.org> ---
(In reply to Philip Paeps from comment #12)

It is a pretty old bug and there are reports of it plaguing people from at
least five years ago that we've found in the wild.

It's quite a low risk change- even if we do a second pass unnecessarily, the
first pass will have marked everything as called already and we'll just waste
soem cycles traversing the list.

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