[Xen-devel] a few xen swiotlb cleanups

[Christoph Hellwig <hch@xxxxxx>]

Hi all,

below are a couple of cleanups for swiotlb-xen.c.  They were done in
preparation of eventually using the dma-noncoherent.h cache flushing
hooks, but that final goal will need some major work to the arm32 code
first.  Until then I think these patches might be better in mainline
than in my local tree so that they don't bitrot.

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