Currently, if wbt is initialized and then disabled by
wbt_disable_default(), sysfs will still show valid wbt_lat_usec, which
will confuse users that wbt is still enabled.

This patch shows wbt_lat_usec as zero if it's disabled.
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Reported-and-tested-by: NHolger Hoffstätte <holger@applied-asynchrony.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221019121518.3865235-5-yukuai1@huaweicloud.comSigned-off-by: NJens Axboe <axboe@kernel.dk>