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Split out the logic that allocates a struct iommu into a separate function. This can fail however the calling code has never cared - so just return if we can't allocate an iommu. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul Mackerras <paulus@samba.org>