sctp_make_ftsn_chunk
extern mblk_t *sctp_make_ftsn_chunk(sctp_t *, sctp_faddr_t *,
nmp = sctp_make_ftsn_chunk(sctp, fp, sets, nsets, seglen);
*nmp = sctp_make_ftsn_chunk(sctp, fp, sets, nsets, *seglen);