vdo_get_partition
int result = vdo_get_partition(layout, id, &partition);
result = vdo_get_partition(layout, REQUIRED_PARTITIONS[i], &partition);
result = vdo_get_partition(&states->layout, VDO_SLAB_DEPOT_PARTITION,
result = vdo_get_partition(&states->layout, VDO_BLOCK_MAP_PARTITION,
result = vdo_get_partition(layout, id, NULL);
int __must_check vdo_get_partition(struct layout *layout, enum partition_id id,
result = vdo_get_partition(&vdo->states.layout, id, &partition);