block: don't skip empty device in in disk_uevent
Restore the previous behavior by using the correct flag for the whole device ("part0"). Fixes: 99dfc43e ("block: use ->bi_bdev for bio based I/O accounting") Reported-by: John Stultz <john.stultz@linaro.org> Tested-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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