Use uint32_t to hold return values from ERR_get_error() and ERR_peek_error().

crypto/openssl_util.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "crypto/openssl_util.h"
 
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 #include <openssl/cpu.h>
 
@@ skipping 98 matching lines @@
 }
 
 }  // namespace
 
 void EnsureOpenSSLInit() {
   (void)OpenSSLInitSingleton::GetInstance();
 }
 
 void ClearOpenSSLERRStack(const tracked_objects::Location& location) {
   if (logging::DEBUG_MODE && VLOG_IS_ON(1)) {
-    int error_num = ERR_peek_error();
+    uint32_t error_num = ERR_peek_error();
     if (error_num == 0)
       return;
 
     std::string message;
     location.Write(true, true, &message);
     DVLOG(1) << "OpenSSL ERR_get_error stack from " << message;
     ERR_print_errors_cb(&OpenSSLErrorCallback, NULL);
   } else {
     ERR_clear_error();
   }
 }
 
 }  // namespace crypto