block: replace continue with else-if in elv_iosched_show

else-if is more readable than continue here.

Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Link: https://lore.kernel.org/r/77ac19ba556efd2c8639a6396eb4203c59bc13d6.1669736350.git.nickyc975@zju.edu.cn


Signed-off-by: Jens Axboe <axboe@kernel.dk>