The loop device infrastructure does not support sysfs dump-based data.
When lsblk runs with --sysroot, the ignore_empty() function calls
loopdev_has_backing_file() which operates on the real /dev/loopN
device rather than the sysroot data. This causes host-dependent test
results -- if the CI machine has a loop device with a backing file,
the device appears in the output despite having size 0 in the dump.
Remove loop0 and loop1 entries from the multi-devs-bcachefs sysfs
dump to avoid this false positive.
Signed-off-by: Karel Zak <kzak@redhat.com>