Make verify_data return the correct error code.

src/platform/vboot_reference/utils/verify_data.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.
  */
 
 /* Routines for verifying a file's signature. Useful in testing the core
  * RSA verification implementation.
  */
 
 #include <fcntl.h>
@@ skipping 61 matching lines @@
     return NULL;
   }
 
   close(sigfd);
   return signature;
 }
 
 
 int main(int argc, char* argv[]) {
   int i, algorithm, sig_len;
+  int return_code = 1;  /* Default to error. */
   uint8_t* digest = NULL;
   uint8_t* signature = NULL;
   RSAPublicKey* key = NULL;
 
   if (argc!=5) {
     fprintf(stderr, "Usage: %s <algorithm> <key file> <signature file>"
             " <input file>\n\n", argv[0]);
     fprintf(stderr, "where <algorithm> depends on the signature algorithm"
             " used:\n");
     for(i = 0; i<kNumAlgorithms; i++)
       fprintf(stderr, "\t%d for %s\n", i, algo_strings[i]);
     return -1;
   }
 
   algorithm = atoi(argv[1]);
   if (algorithm >= kNumAlgorithms) {
     fprintf(stderr, "Invalid Algorithm!\n");
     return 0;
   }
   /* Length of the RSA Signature/RSA Key */
   sig_len = siglen_map[algorithm] * sizeof(uint32_t);
 
   if (!(key = read_RSAkey(argv[2])))
     goto failure;
   if (!(signature = read_signature(argv[3], sig_len)))
     goto failure;
   if (!(digest = DigestFile(argv[4], algorithm)))
     goto failure;
-  if(RSA_verify(key, signature, sig_len, algorithm, digest))
+  if(RSA_verify(key, signature, sig_len, algorithm, digest)) {
+    return_code = 0;
     fprintf(stderr, "Signature Verification SUCCEEDED.\n");
-  else
+  }
+  else {
     fprintf(stderr, "Signature Verification FAILED!\n");
+  }
 
 failure:
   free(key);
   free(signature);
   free(digest);
 
-  return 0;
+  return return_code;
 }