nwam_ncu_prop_read_only
if (nwam_ncu_prop_read_only(prop, &ro) == NWAM_SUCCESS && ro)
extern nwam_error_t nwam_ncu_prop_read_only(const char *, boolean_t *);
(err = nwam_ncu_prop_read_only(propname, &ro_prop)) != NWAM_SUCCESS)
(err = nwam_ncu_prop_read_only(propname, &ro_prop)) != NWAM_SUCCESS)