block: merge: get the 1st and last bvec via helpers
This patch applies the two introduced helpers to figure out the 1st and last bvec. Reviewed-by: NSagi Grimberg <sagig@mellanox.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NMing Lei <ming.lei@canonical.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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