Leftover variable name spotted by Amr Mostafa, reported by email (because 'the...

Leftover variable name spotted by Amr Mostafa, reported by email (because 'the fix is too small and trivial to submit an issue')

includes/language.inc

@@ -107,7 +107,7 @@ function language_url_rewrite(&$path, &$options) {
         break;
 
       case LANGUAGE_NEGOTIATION_DOMAIN:
-        if ($rewritelang->domain) {
+        if ($path_language->domain) {
           $options['absolute'] = TRUE;
           $path = $path_language->domain .'/'. $path;
         }