nvme: factor out a nvme_unmap_data helper
This is the counter part to nvme_map_data. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
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This is the counter part to nvme_map_data. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>