Fix compiler errors on MSVC

firmware/lib/rollback_index.c

 /* Copyright (c) 2010-2011 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.
  *
  * Functions for querying, manipulating and locking rollback indices
  * stored in the TPM NVRAM.
  */
 
 #include "rollback_index.h"
 
@@ skipping 336 matching lines @@
   return WriteSpaceFirmware(&rsf);
 }
 
 uint32_t RollbackFirmwareLock(void) {
   return TlclSetGlobalLock();
 }
 
 uint32_t RollbackKernelRecovery(int developer_mode) {
   uint32_t rvs, rve;
   RollbackSpaceFirmware rsf;
-  uint8_t out_digest[20];  /* For PCR extend output */
 
   /* In recovery mode we ignore TPM malfunctions or corruptions, and *
    * leave the TPM complelely unlocked; we call neither
    * TlclSetGlobalLock() nor TlclLockPhysicalPresence().  The recovery
    * kernel will fix the TPM (if needed) and lock it ASAP.  We leave
    * Physical Presence on in either case. */
   rvs = SetupTPM(1, developer_mode, &rsf);
   rve = SetTPMBootModeState(developer_mode,
                             1,  /* Recovery Mode Status. */
                             0);  /* In recovery mode, there is no RW firmware
@@ skipping 40 matching lines @@
 
 uint32_t RollbackKernelLock(void) {
   if (g_rollback_recovery_mode) {
     return TPM_SUCCESS;
   } else {
     return TlclLockPhysicalPresence();
   }
 }
 
 #endif // DISABLE_ROLLBACK_TPM