[Bug 243747] lib/libc/net/rcmd.c: add another length check to the iruserok_sa

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243747

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: markj
Date: Wed Feb  5 16:09:44 UTC 2020
New revision: 357575
URL: https://svnweb.freebsd.org/changeset/base/357575

Log:
  Improve validation of the sockaddr length in iruserok_sa().

  Negative numbers are not valid sockaddr lengths.

  PR:           243747
  Submitted by: Andrew Reiter <areiter at veracode.com>
  MFC after:    1 week

Changes:
  head/lib/libc/net/rcmd.c

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