iommu/amd: Remove redundant error check in amd_iommu_probe_device()

iommu/amd: Remove redundant error check in amd_iommu_probe_device()

iommu_init_device() is not returning -ENOTSUPP since commit 61289cbaf6c8
("iommu/amd: Remove old alias handling code").

No functional change intended.

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240118090105.5864-6-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>