test: fix redeclared test-event-emitter-* vars

PR-URL: nodejs#4985
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>

test/parallel/test-event-emitter-check-listener-leaks.js

@@ -6,7 +6,7 @@ var events = require('events');
 var e = new events.EventEmitter();
 
 // default
-for (var i = 0; i < 10; i++) {
+for (let i = 0; i < 10; i++) {
   e.on('default', function() {});
 }
 assert.ok(!e._events['default'].hasOwnProperty('warned'));
@@ -15,7 +15,7 @@ assert.ok(e._events['default'].warned);
 
 // specific
 e.setMaxListeners(5);
-for (var i = 0; i < 5; i++) {
+for (let i = 0; i < 5; i++) {
   e.on('specific', function() {});
 }
 assert.ok(!e._events['specific'].hasOwnProperty('warned'));
@@ -31,7 +31,7 @@ assert.ok(e._events['only one'].hasOwnProperty('warned'));
 
 // unlimited
 e.setMaxListeners(0);
-for (var i = 0; i < 1000; i++) {
+for (let i = 0; i < 1000; i++) {
   e.on('unlimited', function() {});
 }
 assert.ok(!e._events['unlimited'].hasOwnProperty('warned'));
@@ -40,7 +40,7 @@ assert.ok(!e._events['unlimited'].hasOwnProperty('warned'));
 events.EventEmitter.defaultMaxListeners = 42;
 e = new events.EventEmitter();
 
-for (var i = 0; i < 42; ++i) {
+for (let i = 0; i < 42; ++i) {
   e.on('fortytwo', function() {});
 }
 assert.ok(!e._events['fortytwo'].hasOwnProperty('warned'));

test/parallel/test-event-emitter-listeners-side-effects.js

@@ -4,7 +4,6 @@ require('../common');
 var assert = require('assert');
 
 var EventEmitter = require('events').EventEmitter;
-var assert = require('assert');
 
 var e = new EventEmitter();
 var fl;  // foo listeners