* @param ev Event loop or 0 to block
* @param recheck 1 to recheck lengths, 0 to suppress check
* @param rescanned Called on completion (if not NULL)
- * @param u Passed to @p rescanned
+ * @param ru Passed to @p rescanned
*/
void trackdb_rescan(ev_source *ev, int recheck,
void (*rescanned)(void *ru),