Redundant page state re-checks in buf_LRU_free_from_unzip_LRU_list() and buf_LRU_free_from_common_LRU_list()

buf_LRU_free_from_unzip_LRU_list() is always called with the LRU list mutex held but contains the following, slightly reduced:

 for (block = UT_LIST_GET_LAST(buf_pool->unzip_LRU);
      UNIV_LIKELY(block != NULL);
      block = UT_LIST_GET_PREV(unzip_LRU, block)) {

  mutex_enter(&block->mutex);
  if (!block->in_unzip_LRU_list || !block->page.in_LRU_list
      || buf_block_get_state(block) != BUF_BLOCK_FILE_PAGE) {
   mutex_exit(&block->mutex);
   goto restart;
  }

The if statement is redundant. Neither one of the three conditions checked there may change while the LRU mutex is held, and it's not being released here.