8267860: Off-by-one bug when searching arrays in AlpnGreaseTest

Backport-of: 2adef6a1f84d478bb38b179795f08ffa43680e36

Author: amosshi

test/jdk/sun/security/ssl/ALPN/AlpnGreaseTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2020, 2022, 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
@@ -83,7 +83,7 @@ public class AlpnGreaseTest implements SSLContextTemplate {
             new String(greaseBytes, StandardCharsets.ISO_8859_1);
 
     private static void findGreaseInClientHello(byte[] bytes) throws Exception {
-        for (int i = 0; i < bytes.length - greaseBytes.length; i++) {
+        for (int i = 0; i < bytes.length - greaseBytes.length + 1; i++) {
             if (Arrays.equals(bytes, i, i + greaseBytes.length,
                     greaseBytes, 0, greaseBytes.length)) {
                 System.out.println("Found greaseBytes in ClientHello at: " + i);