[filescanner] Fix nested transaction

src/filescanner.c

@@ -1229,10 +1229,11 @@ bulk_scan(int flags)
       DPRINTF(E_DBG, L_SCAN, "Purging old database content\n");
       db_purge_cruft(start);
       db_groups_cleanup();
-      db_queue_cleanup();
 
       db_transaction_end();
 
+      db_queue_cleanup();
+
       cache_artwork_purge_cruft(start);
 
       DPRINTF(E_LOG, L_SCAN, "Bulk library scan completed in %.f sec\n", difftime(end, start));