8259563: The CPU model name is printed multiple times when using -Xlog:os+cpu

Reviewed-by: dholmes

Author: wangxues

src/hotspot/os/linux/os_linux.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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
@@ -2464,10 +2464,10 @@ static bool print_model_name_and_flags(outputStream* st, char* buf, size_t bufle
   // Other platforms have less repetitive cpuinfo files
   FILE *fp = fopen("/proc/cpuinfo", "r");
   if (fp) {
+    bool model_name_printed = false;
     while (!feof(fp)) {
       if (fgets(buf, buflen, fp)) {
         // Assume model name comes before flags
-        bool model_name_printed = false;
         if (strstr(buf, "model name") != NULL) {
           if (!model_name_printed) {
             st->print_raw("CPU Model and flags from /proc/cpuinfo:\n");