cpc_buf_destroy
(void) cpc_buf_destroy(sgrp->cpc, sgrp->sets[sgrp->current].data1);
(void) cpc_buf_destroy(sgrp->cpc, sgrp->sets[sgrp->current].data2);
(void) cpc_buf_destroy(sgrp->cpc, sgrp->sets[sgrp->current].scratch);
(void) cpc_buf_destroy(cpc, cpc->cpc_bufs);
extern int cpc_buf_destroy(cpc_t *cpc, cpc_buf_t *buf);