if (maybe_config_get(driver, sdi, channel_group, key, &gvar) == SR_OK) {
g_variant_get(gvar, "(dd)", &dcur_low, &dcur_high);
g_variant_unref(gvar);
if (maybe_config_get(driver, sdi, channel_group, key, &gvar) == SR_OK) {
g_variant_get(gvar, "(dd)", &dcur_low, &dcur_high);
g_variant_unref(gvar);