iommu/vt-d: remove the mapping_error dma_map_ops method
Return DMA_MAPPING_ERROR instead of 0 on a dma mapping failure and let the core dma-mapping code handle the rest. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
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