sctp_add_ftsn_set
extern boolean_t sctp_add_ftsn_set(sctp_ftsn_set_t **, sctp_faddr_t *, mblk_t *,
!sctp_add_ftsn_set(&sets, fp, meta, &nsets, &seglen)) {
!sctp_add_ftsn_set(&sets, fp, meta, &nsets, seglen)) {