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Let the accept functions provide stack memory for protocols to fill it in.
Generic code should provide sockaddr_storage, specialized code may provide
smaller structure.
While rewriting accept(2) make 'addrlen' a true in/out parameter, reporting
required length in case if provided length was insufficient. Our manual
page accept(2) and POSIX don't explicitly require that, but one can read
the text as they do. Linux also does that. Update tests accordingly.
Reviewed by: rscheff, tuexen, zlei, dchagin
Differential Revision: https://reviews.freebsd.org/D42635
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