fixed eslint error

Author: scottinet

src/kuzzleDocument.js

@@ -237,14 +237,15 @@ KuzzleDocument.prototype.refresh = function (options, cb) {
 KuzzleDocument.prototype.save = function (options, cb) {
   var
     data = this.toJSON(),
-    self = this;
+    self = this,
+    queryCB;
 
   if (options && cb === undefined && typeof options === 'function') {
     cb = options;
     options = null;
   }
 
-  var queryCB = function (error, result) {
+  queryCB = function (error, result) {
     if (error) {
       return cb ? cb(error) : false;
     }