Include missing header.

src/platform/vboot_reference/utils/kernel_utility.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Utility for manipulating verified boot firmware images.
 //
 
 #include "kernel_utility.h"
 
 #include <errno.h>
 #include <getopt.h>
+#include <stdio.h>
 #include <stdint.h>  // Needed for UINT16_MAX.
 #include <stdlib.h>
 #include <unistd.h>
 
 #include <iostream>
 
 extern "C" {
 #include "file_keys.h"
 #include "kernel_image.h"
 #include "padding.h"
@@ skipping 326 matching lines @@
   }
   if (fu.is_verify()) {
     cerr << "Verification ";
     if (fu.VerifySignedImage())
       cerr << "SUCCESS.\n";
     else
       cerr << "FAILURE.\n";
   }
   return 0;
 }