md/raid5: call roundup_pow_of_two in raid5_run
Let's call roundup_pow_of_two here instead of open code. Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev> Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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