Read of Uninitialized memory during buffer pool resizing

 uint32_t unfix()

  {

    uint32_t fix_count= page.unfix();

    ut_ad(fix_count || page.io_fix() != BUF_IO_NONE ||

          page.state() == BUF_BLOCK_ZIP_PAGE ||

          !rw_lock_own_flagged(&lock, RW_LOCK_FLAG_X | RW_LOCK_FLAG_S |

                               RW_LOCK_FLAG_SX));

    return fix_count;

  }