zbd: simplify zoneskip= validness check

Simply check the remainder:

	(zoneskip % zone_size) > 0

It will do the right thing for all zoneskip= values, and
zone size being positive is checked earlier.

Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Signed-off-by: Alexey Dobriyan (SK hynix) <adobriyan@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed