iommu/amd: Fix device_state reference counting
The references to the device state are not dropped everywhere. This might cause a dead-lock in amd_iommu_free_device(). Fix it. Signed-off-by: Joerg Roedel <jroedel@suse.de> Tested-by: Oded Gabbay <oded.gabbay@amd.com>
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