[Bug 277783] libc fma() doesn't not return the correct zero sign

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277783

--- Comment #18 from Ed Maste <emaste@freebsd.org> ---
(In reply to Steve Kargl from comment #17)
> Perhaps, the comments needs an update, but I'm not sure to what.

The comment has "When the addends cancel to 0", which exactly mirrored the if
condition. We could extend it to something like "When the addends cancel to 0
and ..." but that seems excessive. Perhaps just "Ensure the result has the
correct sign ." which leaves a clue as to why the special case exists.

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