intel-iommu: Cope with broken HP DC7900 BIOS
Yet another reason why trusting this stuff to the BIOS was a bad idea.
The HP DC7900 BIOS reports an iommu at an address which just returns all
ones, when VT-d is disabled in the BIOS.
Fix up the missing iounmap in the error paths while we're at it.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
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