swiotlb: clear io_tlb_start and io_tlb_end in swiotlb_exit
Otherwise is_swiotlb_buffer will return false positives when we first initialize a swiotlb buffer, but then free it because we have an IOMMU available. Fixes: 55897af6 ("dma-direct: merge swiotlb_dma_ops into the dma_direct code") Reported-by: Sibren Vasse <sibren@sibrenvasse.nl> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Sibren Vasse <sibren@sibrenvasse.nl> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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