address_to_channel
(void) address_to_channel(node, addr, 0, 0, 0, &channels);
(void) address_to_channel(0, addr, 0, 0, 0, &channels);
(void) address_to_channel(1, addr, 0, 0, 0, &channels1);
channel = address_to_channel(node, pa, syndtype, &log_chan, &caddr, 0);