Fix test return values (otherwise, autotest mistakenly thinks it failed).

src/platform/vboot_reference/tests/kernel_image_tests.c

 /* 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.
  *
  * Tests for kernel image library.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 
@@ skipping 136 matching lines @@
 }
 
 int main(int argc, char* argv[]) {
   uint64_t len;
   uint8_t* kernel_sign_key_buf = NULL;
   uint8_t* firmware_key_blob = NULL;
   uint8_t* kernel_blob = NULL;
   uint64_t kernel_blob_len = 0;
   KernelImage* image = NULL;
   RSAPublicKey* firmware_key = NULL;
-  int error_code = 1;
+  int error_code = 0;
 
   if(argc != 7) {
     fprintf(stderr, "Usage: %s <firmware signing algorithm> "  /* argv[1] */
             "<kernel signing algorithm> "  /* argv[2] */
             "<firmware key> "  /* argv[3] */
             "<processed firmware pubkey> "  /* argv[4] */
             "<kernel signing key> "  /* argv[5] */
             "<processed kernel signing key>\n",  /* argv[6] */
             argv[0]);
     return -1;
@@ skipping 46 matching lines @@
 
 failure:
   Free(kernel_blob);
   KernelImageFree(image);
   Free(kernel_sign_key_buf);
   Free(firmware_key_blob);
   RSAPublicKeyFree(firmware_key);
 
   return error_code;
 }