vm_rpc_get_length
if (vm_rpc_get_length(&sc->sc_tclo_rpc, &rlen, &ack) != 0) {
if (vm_rpc_get_length(&rpci, &rlen, &ack) != 0) {
int vm_rpc_get_length(const struct vm_rpc *, uint32_t *, uint16_t *);
if (vm_rpc_get_length(&rpci, &rlen, &ack) != 0) {