verity: don't error on depth=0

file_hasher.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by the GPL v2 license that can
 // be found in the LICENSE file.
 //
 // Implementation of FileHasher
 
 #define __STDC_LIMIT_MACROS 1
 #define __STDC_FORMAT_MACROS 1
 #include <errno.h>
 #include <inttypes.h>
@@ skipping 30 matching lines @@
   }
   dm_bht_write_completed(entry, 0);
   return 0;
 }
  
 bool FileHasher::Initialize(simple_file::File *source,
                             simple_file::File *destination,
                             unsigned int depth,
                             unsigned int blocks,
                             const char *alg) {
-  if (depth == 0 || !alg || !source || !destination) {
+  if (!alg || !source || !destination) {
      LOG(ERROR) << "Invalid arguments supplied to Initialize";
      LOG(INFO) << "depth: " << depth;
      LOG(INFO) << "s: " << source << " d: " << destination;
      return false;
   }
   if (source_ || destination_) {
     LOG(ERROR) << "Initialize called more than once";
     return false;
   }
   if (blocks > source->Size() / PAGE_SIZE) {
@@ skipping 58 matching lines @@
   unsigned int hash_start = 0;
   unsigned int root_end = to_sector(block_limit_ << PAGE_SHIFT);
   if (colocated) hash_start = root_end;
   printf("0 %u verity ROOT_DEV HASH_DEV %u %u %s %s\n",
          root_end, hash_start, depth_, alg_, digest);
 }
 
 }  // namespace verity