bug#33458: 27.0.50; dired loses position when reverted from outside place

[martin rudalics]

> Unfortunately, now Dired fails to visit a directory:
>
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>    file-name-absolute-p(nil)
>    dired-goto-file(nil)
>    dired-restore-positions(((#<buffer /tmp/> nil 3) nil ((#<marker at 1 in 
/tmp/> nil 3))))
>    dired-revert(nil nil)
>    revert-buffer()
>    dired-internal-noselect("/tmp/" nil)
>    dired-noselect("/tmp/" nil)
>    dired("/tmp/")
>    dired-jump(nil nil)
>    funcall-interactively(dired-jump nil nil)
>    call-interactively(dired-jump nil nil)
>    command-execute(dired-jump)
>
> Maybe this happens when a reverted directory window is restored
> from a window configuration, so point-marker is at 1,
> and (dired-get-filename nil t) returns nil in `dired-save-positions'.

Looks like a silly typo.  Please try the attached patch.  If it does
not help, please provide me a simple scenario to reproduce the bug.

Thanks, martin

dired.el.diff
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