Delete statistics data on node_delete()

feedapi_nodeapi() functions "delete" case deletes feed record from "feedapi" table. Records from "feedapi_stat" table should be deleted too.

function feedapi_nodeapi(&$node, $op, $teaser, $page) {
    switch ($op) {
      case 'delete':
        db_query("DELETE FROM {feedapi_stat} WHERE id = %d", $node->nid); 
    } 
}