Leave groups of chainlock inside traverse.

ccan/tdb/tools/replay_trace.c

@@ -435,7 +435,9 @@ static void op_analyze_traverse(const char *filename,
 
 	op[start].group_len = op_num - start;
 
+	/* Don't roll in nested traverse/chainlock */
 	for (i = start; i <= op_num; i++)
+		if (!op[i].group_start)
 			op[i].group_start = start;
 }