[squash] fix error + conform to test style

Author: refack

benchmark/child_process/child-process-read.js

@@ -1,6 +1,11 @@
 'use strict';
 const common = require('../common.js');
+
+// This benchmark uses `yes` to create noisy child_processes with varying
+// output message lengths, and tries to read 8GB of output
+
 const os = require('os');
+const child_process = require('child_process');
 
 var messagesLength = [64, 256, 1024, 4096];
 // Windows does not support that long arguments
@@ -12,7 +17,6 @@ const bench = common.createBenchmark(main, {
   dur: [5]
 });
 
-const spawn = require('child_process').spawn;
 function main(conf) {
   bench.start();
 
@@ -21,7 +25,7 @@ function main(conf) {
 
   const msg = `"${'.'.repeat(len)}"`;
   const options = { 'stdio': ['ignore', 'pipe', 'ignore'] };
-  const child = spawn('yes', [msg], options);
+  const child = child_process.spawn('yes', [msg], options);
 
   var bytes = 0;
   child.stdout.on('data', function(msg) {