nwam_delete_prop
if ((err = nwam_delete_prop(enmh->nwh_data, propname))
extern nwam_error_t nwam_delete_prop(void *, const char *);
if ((err = nwam_delete_prop(kwh->nwh_data, propname)) != NWAM_SUCCESS) {
if ((err = nwam_delete_prop(loch->nwh_data, propname))
if ((err = nwam_delete_prop(ncuh->nwh_data, propname))