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Convenience macro to iterate over every struct group_device in the group.

Replace all open coded list_for_each_entry's with this macro.
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v5-1b99ae392328+44574-iommu_err_unwind_jgg@nvidia.com

Signed-off-by: Joerg Roedel <jroedel@suse.de>