- xrchart_write_xscale (cr, geom, dnpp->y_min, dnpp->y_max);
- xrchart_write_yscale (cr, geom, dnpp->dns_min, dnpp->dns_max);
+ if (! xrchart_write_xscale (cr, geom, dnpp->y_min, dnpp->y_max))
+ return;
+ if (! xrchart_write_yscale (cr, geom, dnpp->dns_min, dnpp->dns_max))
+ return;