cc6182e8540a348c664bcbb4af85701ddc36e5a6
sd_seat_get_sessions returns two arrays, that in principle should always match: the session names and corresponding uids. The second array could be shorter only if parsing or uid conversion fails. But in that case there is no way to tell *which* uid is wrong, so they are *all* useless. It's better to simplify things and just return an error if parsing fails.
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