Let's exit early if we are invoked to generate an fsck unit for the rootfs or /usr of the initrd itself. The "systemd-root-fsck.service" and "systemd-usr-fsck.service" units are after all for the host file systems, and the initrd file hierarchy is from an unpacked cpio anyway. Hence, this semantically doesn't really make sense, so quickly exit if we detect this case. This allows us to remove some checks further down the codepath.
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