sizeof_scsi_devid_desc
sdid_size = sizeof_scsi_devid_desc(ident_length);
dup_size = sizeof_scsi_devid_desc(did->ident_length);
kmem_free(did, sizeof_scsi_devid_desc(did->ident_length));
static size_t sizeof_scsi_devid_desc(int ident_length);