This adds the proper check to alloc_iommu to make sure that
the call to iommu_device_create has completed successfully
and if not return the error code to the caller after freeing
up resources allocated previously.
Signed-off-by: NNicholas Krause <xerofoify@gmail.com>
Signed-off-by: NJoerg Roedel <jroedel@suse.de>