zbd: initialize sectors with data at start time

zbd: initialize sectors with data at start time

Based on the flag enable_check_swd, which is false by default, fio
does not initialize the swd value at startup, initializing the swd
value to be zero, even if some zones have sectors with data. This can
result in fio reflecting less than actual swd after a few writes are
completed. In workloads where verify is enabled, fio resets all the
zones and while resetting, it decrements the swd counter with the
actual number of swds in that zone(swd-count - swd-in-zone),
since swd-count is initialized to 0, it results in overflow of the
variable causing unpredictable issues.

So, initialize the swd to the correct value.

Fixes: 409a4f291e7f ("zbd: avoid initializing swd when unnecessary")
Signed-off-by: Aravind Ramesh <aravind.ramesh@wdc.com>
Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Reviewed-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>