benchmark, http: refactor for code consistency

In benchmark http directory this changes for loops using var to let
when it applies for consistency

PR-URL: https://github.com/nodejs/node/pull/28791
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/benchmark/http/check_invalid_header_char.js b/benchmark/http/check_invalid_header_char.js
index 46ca9f3d73..245dc6fb8e 100644
--- a/benchmark/http/check_invalid_header_char.js
+++ b/benchmark/http/check_invalid_header_char.js
@@ -61,7 +61,7 @@ function main({ n, input }) {
 
   const len = inputs.length;
   bench.start();
-  for (var i = 0; i < n; i++) {
+  for (let i = 0; i < n; i++) {
     _checkInvalidHeaderChar(inputs[i % len]);
   }
   bench.end(n);