const char *errmsg; // unused: carries same info as `errcode'
const char *addinfo;
if ((errcode = ZOOM_connection_error(c, &errmsg, &addinfo)) != 0) {
const char *errmsg; // unused: carries same info as `errcode'
const char *addinfo;
if ((errcode = ZOOM_connection_error(c, &errmsg, &addinfo)) != 0) {