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VT-d: correct off-by-1 in number-of-IOMMUs check
Otherwise, if we really run on a system with this many IOMMUs, entering/leaving S3 would overrun iommu_state[]. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Release-Acked-by: Ian Jackson <iwj@xenproject.org>
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