[Bug 218919] setsockopt() accepts too long arguments allowing programmer errors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218919

--- Comment #4 from Brooks Davis <brooks at FreeBSD.org> ---
I did a quick scan of sooptcopyin() use and only a tiny portion of callers call
with a minlength less than length.  We should likely separate the two usecases.

Separately, only one case seems to use the support for overly long arguments. 
If most cases that support seems harmful since it allows userspace programming
errors to be hidden.

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