dc_next
m = m->dc_next;
m->dc_next = sc->dc_mi;
m->dc_next = sc->dc_mi;
m->dc_next = sc->dc_mi;
m = sc->dc_mi->dc_next;
m = sc->dc_mi->dc_next;
ld->dc_tx_list[i].dc_next = htole32(DC_TXDESC(sc, nexti));
ld->dc_rx_list[i].dc_next = htole32(DC_RXDESC(sc, nexti));
struct dc_mediainfo *dc_next;