iommu: Propagate error in add_iommu_group
Make sure any errors reported from the IOMMU drivers get
progapated back to the IOMMU core.
Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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Make sure any errors reported from the IOMMU drivers get
progapated back to the IOMMU core.
Signed-off-by: NJoerg Roedel <jroedel@suse.de>