Niels Thykier 3fcff0d75f Align open_fdinfo_dir with pidfds_to_pids
The function `pidfds_to_pids` expected `-1` if `open_fdinfo_dir` failed but the latter returned `errno` which is hard to distinguish from a valid file handle.  Correct that by making `open_fdinfo_dir` a wrapper around `open`.
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