by Dave Reid: Fixed bug in xmlsitemap_run_progressive_batch().

xmlsitemap.module

@@ -1140,7 +1140,7 @@ function xmlsitemap_context_check(array $context) {
  */
 function xmlsitemap_run_progressive_batch() {
   $args = func_get_args();
-  $batch_callback = array_shift();
+  $batch_callback = array_shift($args);
 
   // Build the batch array.
   $batch = call_user_func_array($batch_callback, $args);