verity: remove the depth parameter from bht_create

dm-bht.h

 /*
  * Copyright (C) 2010 The Chromium OS Authors <chromium-os-dev@chromium.org>
  *
  * Device-Mapper block hash tree interface.
  * See Documentation/device-mapper/dm-bht.txt for details.
  *
  * This file is released under the GPLv2.
  */
 #ifndef __LINUX_DM_BHT_H
 #define __LINUX_DM_BHT_H
@@ skipping 92 matching lines @@
         atomic_t root_state; /* Uses UNALLOCATED, REQUESTED, and VERIFIED */
         struct dm_bht_level *levels;  /* in reverse order */
         mempool_t *entry_pool;
         /* Callbacks for reading and/or writing to the hash device */
         dm_bht_callback read_cb;
         dm_bht_callback write_cb;
 };
 
 /* Constructor for struct dm_bht instances. */
 int dm_bht_create(struct dm_bht *bht,
-                  unsigned int depth,
                   unsigned int block_count,
                   const char *alg_name);
 /* Destructor for struct dm_bht instances.  Does not free @bht */
 int dm_bht_destroy(struct dm_bht *bht);
 
 /* Basic accessors for struct dm_bht */
 sector_t dm_bht_sectors(const struct dm_bht *bht);
 void dm_bht_set_read_cb(struct dm_bht *bht, dm_bht_callback read_cb);
 void dm_bht_set_write_cb(struct dm_bht *bht, dm_bht_callback write_cb);
 int dm_bht_set_root_hexdigest(struct dm_bht *bht, const u8 *hexdigest);
@@ skipping 12 matching lines @@
  */
 int dm_bht_compute(struct dm_bht *bht, void *read_cb_ctx);
 int dm_bht_sync(struct dm_bht *bht, void *write_cb_ctx);
 int dm_bht_store_block(struct dm_bht *bht, unsigned int block_index,
                        u8 *block_data);
 int dm_bht_zeroread_callback(void *ctx, sector_t start, u8 *dst, sector_t count,
                              struct dm_bht_entry *entry);
 void dm_bht_read_completed(struct dm_bht_entry *entry, int status);
 void dm_bht_write_completed(struct dm_bht_entry *entry, int status);
 #endif  /* __LINUX_DM_BHT_H */