[Bug 200942] fts_children doesn't preserve errno after running close/fchdir

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200942

            Bug ID: 200942
           Summary: fts_children doesn't preserve errno after running
                    close/fchdir
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

Noticed in an internal code review -- in particular mjohnston noted that
fts_open doesn't preserve the errno after close/fchdir is called and Conrad
Meyer confirmed it:
https://svnweb.freebsd.org/base/head/lib/libc/gen/fts.c?view=annotate#l571

This might be the root cause behind a handful of other bugs with rm related to
fts_open, etc.

Spotted by: mjohnston
In collaboration with: Conrad Meyer

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