benchmark: use let instead of var in dns

dnlup · targos · commit c8ee5cf70746 · 2020-04-26T00:28:37.000+02:00
PR-URL: nodejs#31794 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
diff --git a/benchmark/dns/lookup.js b/benchmark/dns/lookup.js
@@ -10,7 +10,7 @@ const bench = common.createBenchmark(main, {
 });
 
 function main({ name, n, all }) {
-  var i = 0;
+  let i = 0;
 
   if (all === 'true') {
     const opts = { all: true };
