8330598: java/net/httpclient/Http1ChunkedTest.java fails with java.util.MissingFormatArgumentException: Format specifier '%s'

Backport-of: c9c3c1536880d81ab84d5cb55f4fd0fe3bbf60a2

Author: GoeLin

test/jdk/java/net/httpclient/Http1ChunkedTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -97,7 +97,7 @@ private static void test(String name, String headers, List<String> body, long de
                         }
                     }
                     if (!received) {
-                        System.out.printf("%s: Unexpected headers received: dropping request.%n");
+                        System.out.printf("%s: Unexpected headers received: dropping request.%n", name);
                         continue;
                     }
                     OutputStream os = serverConn.getOutputStream();