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Convert to ssize_t return code so the return code from __iommu_map() can be returned all the way down through dma_iommu_map_sg(). Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Will Deacon <will@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de>