Found by coverity; CID 1327892.
@@ -1279,6 +1279,8 @@ geoip_dirreq_stats_write(time_t now)
/* Generate history string .*/
str = geoip_format_dirreq_stats(now);
+ if (! str)
+ goto done;
/* Write dirreq-stats string to disk. */
if (!check_or_create_data_subdir("stats")) {