Remove node context from quiz_question::viewCanRevealCorrect

Inside the quiz_question.core.inc you can find the following function below, together with an @todo to remove the node context.

Looking at the code we still do the node_load(arg(1)), which the todo is talking about. However the variable isn't really used inside the function.

/**
   * Determines if the user can view the correct answers
   *
   * @todo grabbing the node context here probably isn't a great idea
   *
   * @return TRUE|NULL
   *   TRUE if the view may include the correct answers to the question
   */
  public function viewCanRevealCorrect() {
    global $user;
    $quiz_node = node_load(arg(1));

    $reveal_correct[] = user_access('view any quiz question correct response');
    $reveal_correct[] = ($user->uid == $this->node->uid);
    if (array_filter($reveal_correct)) {
      return TRUE;
    }
  }