Fix var error in fnSetFilteringDelay - just a warning, but good to tidy up

api/fnSetFilteringDelay.js

@@ -12,9 +12,11 @@
  */
 
 jQuery.fn.dataTableExt.oApi.fnSetFilteringDelay = function ( oSettings, iDelay ) {
-    var
-        _that = this,
-        iDelay = (typeof iDelay == 'undefined') ? 250 : iDelay;
+	var _that = this;
+
+	if ( iDelay === undefined ) {
+		iDelay = 250;
+	}
 	 
 	this.each( function ( i ) {
 		$.fn.dataTableExt.iApiIndex = i;