Recently, we introduce 'clock' system group, and set it for rtc/ptp devices. See af96ccfc24bc4803078a46b4ef2cdeb5decdfbcd. However, if non-system group with the same name is already exist, previously the devices were owned by the non-system group. That may possibly happen on updating systemd. Let's avoid accidentally devices being owned by non-system user/group.
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