swiotlb-xen: remove BUG_ON in xen_bus_to_phys
On x86 truncation cannot occur because config XEN depends on X86_64 || (X86_32 && X86_PAE). On ARM truncation can occur without CONFIG_ARM_LPAE, when the dma operation involves foreign grants. However in that case the physical address returned by xen_bus_to_phys is actually invalid (there is no mfn to pfn tracking for foreign grants on ARM) and it is not used. Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com> Acked-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> CC: stable@vger.kernel.org
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