block: re-use existing 'reading' variable instead of checking direction again
Signed-off-by:majianpeng <majianpeng@gmail.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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Signed-off-by:majianpeng <majianpeng@gmail.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>