t/zbd: get max_open_zones from sysfs ...by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> ...r/20230719105756.553146-10-shinichiro.kawasaki@wdc.com
zbd: Fix type of local variable min_bs ...by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> ...r/20211013060903.166543-3-shinichiro.kawasaki@wdc.com