heed review comments

Author: Gabriel Schulhof

test/node_modules/duplicate_symbols/common.h

@@ -19,10 +19,8 @@ function runHello(hostProcess) {
   return execFileSync(hostProcess, ['-e', testCode], { cwd: __dirname }).toString()
 }
 
-function runDuplicateBindings(hostProcess) {
-  if (!hostProcess) {
-    hostProcess = process.execPath
-  }
+function runDuplicateBindings() {
+  const hostProcess = process.execPath;
   var testCode =
     "console.log((function(bindings) {" +
     "return bindings.pointerCheck1(bindings.pointerCheck2());" +
@@ -70,15 +68,13 @@ test('make sure addon symbols do not overlap', function (t) {
   var addonPath = path.resolve(__dirname, 'node_modules', 'duplicate_symbols')
   // Set the loglevel otherwise the output disappears when run via 'npm test'
   var cmd = [nodeGyp, 'rebuild', '-C', addonPath, '--loglevel=verbose']
-  var proc = execFile(process.execPath, cmd, function (err, stdout, stderr) {
-    var logLines = stderr.toString().trim().split(/\r?\n/)
+  execFile(process.execPath, cmd, function (err, stdout, stderr) {
+    var logLines = stderr.trim().split(/\r?\n/)
     var lastLine = logLines[logLines.length-1]
     t.strictEqual(err, null)
     t.strictEqual(lastLine, 'gyp info ok', 'should end in ok')
     t.strictEqual(runDuplicateBindings().trim(), 'not equal')
   })
-  proc.stdout.setEncoding('utf-8')
-  proc.stderr.setEncoding('utf-8')
 })
 
 test('build simple addon in path with non-ascii characters', function (t) {