smb_decode_sid
sd->sd_owner = smb_decode_sid(mbc, owner_offs);
sd->sd_group = smb_decode_sid(mbc, group_offs);
ace->se_sid = smb_decode_sid(mbc, sid_offs);
sid = smb_decode_sid(mbc, sid_offset);
sid = smb_decode_sid(mbc, sid_offset);
smb_sid_t *smb_decode_sid(mbuf_chain_t *, uint32_t);