lib: scatterlist: Fix to support no mapped sg
In function sg_split, the second sg_calculate_split will return -EINVAL when in_mapped_nents is 0. Indeed there is no need to do second sg_calculate_split and sg_split_mapped when in_mapped_nents is 0, as in_mapped_nents indicates no mapped entry in original sgl. Signed-off-by:Zhou Wang <wangzhou1@hisilicon.com> Acked-by:
Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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