vfio: check iommu_group_set_name() return value

As iommu_group_set_name() can fail, we should check the return value.

Signed-off-by: Liam Ni <zhiguangni01@gmail.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220625114239.9301-1-zhiguangni01@gmail.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>