siba_find_addrspace
addrspace = siba_find_addrspace(dinfo, port_type, port_num, region_num);
addrspace = siba_find_addrspace(dinfo, port_type, port_num, region_num);
addrspace = siba_find_addrspace(dinfo, BHND_PORT_DEVICE, 0, 0);
struct siba_addrspace *siba_find_addrspace(struct siba_devinfo *dinfo,