Unique node title is not working on editing the node

During validation of the title, we will be passing the node id as parameter.
$found_node_with_title = _node_title_validation_find_title_exist($node->title, $node->nid);

So that, node id can be checked with current editing node id.

  $node_id = $result->fetchField();
  if($nid == $node_id){
    return FALSE;
  }else{
    return $result->rowCount();
  }

We can get out of this "There is already a node exist with title".