Fail when measured latnecy is zero

continuous/gw-setup/run.pl

@@ -32,6 +32,7 @@ set -e
 source tmp-stat.txt
 for i in sent lost enobufs $(seq -f percentile%g 0 10 100); do keyval="$keyval $i=$((i))"; done
 echo "! PERF: gw_latency $avg µs $keyval ok"
+test $avg -eq 0 || exit 1
 exit $r
 EOF