MDL-57587 question file access: fix regression caused by MDL-53744

question/type/questionbase.php

@@ -668,11 +668,18 @@ abstract class question_graded_automatically extends question_with_responses
      * @param question_attempt $qa the question attempt being displayed.
      * @param question_display_options $options the options that control display of the question.
      * @param string $filearea the name of the file area.
+     * @param array $args the remaining bits of the file path.
      * @return bool whether access to the file should be allowed.
      */
-    protected function check_combined_feedback_file_access($qa, $options, $filearea) {
+    protected function check_combined_feedback_file_access($qa, $options, $filearea, $args = null) {
         $state = $qa->get_state();
 
+        if ($args === null) {
+            debugging('You must pass $args as the fourth argument to check_combined_feedback_file_access.',
+                    DEBUG_DEVELOPER);
+            $args = array($this->id); // Fake it for now, so the rest of this method works.
+        }
+
         if (!$state->is_finished()) {
             $response = $qa->get_last_qt_data();
             if (!$this->is_gradable_response($response)) {