block: blk-merge: remove unnecessary check
In this case, 'sectors' can't be zero at all, so remove the check and let the bio be split. Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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