mcamd_mc_next
extern mcamd_node_t *mcamd_mc_next(struct mcamd_hdl *, mcamd_node_t *,
for (mc = mcamd_mc_next(hdl, root, NULL); mc != NULL;
mc = mcamd_mc_next(hdl, root, mc)) {
for (mc = mcamd_mc_next(hdl, root, NULL); mc != NULL;
mc = mcamd_mc_next(hdl, root, mc)) {