-/* Call CALLBACK for each non-alias track below ROOT. Return 0 or
- * DB_LOCK_DEADLOCK. CALLBACK should return 0 on success or EINTR to cancel
- * the scan. */
+/* Call CALLBACK for each non-alias track below ROOT (or all tracks if ROOT is
+ * 0). Return 0 or DB_LOCK_DEADLOCK. CALLBACK should return 0 on success or
+ * EINTR to cancel the scan. */