[bugs #12044] find still hangs on dead NFS filesystems on Solaris

[Dmitry V. Levin]

Follow-up Comment #5, bugs #12044 (project findutils):

I like first (chdir/fchdir-back/retry) approach more than second
(stat./chdir/stat..).

I can imagine situation where one can subvert subdirectory with symlink to
another subdirectory in the same directory.
Second check cannot catch this situation.

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