Remove superfluous + operator

Author: mjwwit

lib/XMLHttpRequest.js

@@ -559,7 +559,7 @@ function XMLHttpRequest(opts) {
    * @param  status  {number}    HTTP status code to use rather than the default (0) for XHR errors.
    */
   this.handleError = function(error, status) {
-    this.status = +status || 0;
+    this.status = status || 0;
     this.statusText = error;
     this.responseText = error.stack;
     errorFlag = true;