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The xen_io_tlb_start and xen_io_tlb_nslabs variables are now only used in
xen_swiotlb_init, so replace them with local variables.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>