sg: remove unnecessary blk_rq_unmap_user
blk_rq_unmap_user in sg_finish_rem_req can take care of all the cases. Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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