valgrind error fix

}

static void blackhole_free_key(st_blackhole_share *share)

{

  thr_lock_delete(&share->lock);

  my_free((byte*) share, MYF(0));

} 

bool blackhole_db_init()

{

  DBUG_ENTER("blackhole_db_init");

  if (pthread_mutex_init(&blackhole_mutex, MY_MUTEX_INIT_FAST))

    goto error;

  if (hash_init(&blackhole_open_tables, &my_charset_bin, 32, 0, 0,

                    (hash_get_key) blackhole_get_key, 0, 0))

                    (hash_get_key) blackhole_get_key,

                    (hash_free_key) blackhole_free_key, 0))

  {

    VOID(pthread_mutex_destroy(&blackhole_mutex));

  }