8263895: Test nsk/jvmti/GetThreadGroupChildren/getthrdgrpchld001/getthrdgrpchld001.cpp uses incorrect indices

Reviewed-by: amenkov, kevinw

Author: lmesnik

test/hotspot/jtreg/vmTestbase/nsk/jvmti/GetThreadGroupChildren/getthrdgrpchld001/getthrdgrpchld001.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2021, 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
@@ -351,16 +351,16 @@ static jthreadGroup findThreadGroupByName(jvmtiEnv* jvmti, JNIEnv* jni, const ch
             for (j = 0; j < groupsCount; j++) {
                 jvmtiThreadGroupInfo info;
 
-                if (groups[i] != NULL) {
+                if (groups[j] != NULL) {
 
                     if (!NSK_JVMTI_VERIFY(
-                            jvmti->GetThreadGroupInfo(groups[i], &info))) {
+                            jvmti->GetThreadGroupInfo(groups[j], &info))) {
                         nsk_jvmti_setFailStatus();
                         continue;
                     }
 
                     if (info.name != 0 && strcmp(info.name, name) == 0) {
-                        foundGroup = groups[i];
+                        foundGroup = groups[j];
                         break;
                     }
                 }