style: fixing lint error

Author: daprahamian

test/node/object_id_tests.js

@@ -85,7 +85,7 @@ describe('ObjectId', function() {
    * @ignore
    */
   it('should isValid check input Buffer length', function(done) {
-    var buffTooShort = new Buffer ([]);
+    var buffTooShort = new Buffer([]);
     var buffTooLong = new Buffer([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]);
     var buff12Bytes = new Buffer([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]);