vfio: remove the iommudata check in vfio_noiommu_attach_group

vfio_noiommu_attach_group has two callers:

 1) __vfio_container_attach_groups is called by vfio_ioctl_set_iommu,
    which just called vfio_iommu_driver_allowed
 2) vfio_group_set_container requires already checks ->noiommu on the
    vfio_group, which is propagated from the iommudata in
    vfio_create_group

so this check is entirely superflous and can be removed.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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