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

src/platform/vboot_reference/tests/firmware_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 firmware image library.
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 
@@ skipping 130 matching lines @@
 }
 
 int main(int argc, char* argv[]) {
   uint64_t len;
   uint8_t* firmware_sign_key_buf = NULL;
   uint8_t* root_key_blob = NULL;
   uint8_t* firmware_blob = NULL;
   uint64_t firmware_blob_len = 0;
   FirmwareImage* image = NULL;
   RSAPublicKey* root_key = NULL;
-  int error_code = 1;
+  int error_code = 0;
 
   if(argc != 6) {
     fprintf(stderr, "Usage: %s <algorithm> <root key> <processed root pubkey>"
             " <signing key> <processed signing key>\n", argv[0]);
     return -1;
   }
 
   /* Read verification keys and create a test image. */
   root_key = RSAPublicKeyFromFile(argv[3]);
   root_key_blob = BufferFromFile(argv[3], &len);
@@ skipping 33 matching lines @@
 
 failure:
   Free(firmware_blob);
   FirmwareImageFree(image);
   Free(firmware_sign_key_buf);
   Free(root_key_blob);
   RSAPublicKeyFree(root_key);
 
   return error_code;
 }