[PATCH, HURD]: null pathnames shall return ENOENT

[Roland McGrath]

> __hurd_file_name_lookup already does it, the problem here is that
> before calling it, chdir() systematically appends "/." . Or perhaps
> a cleaner solution would be to not append "/." in that case and let
> __hurd_file_name_lookup return ENOENT?

Cleaner would be to to just pass it O_DIRECTORY.


Thanks,
Roland