iommu/amd: Fix NULL dereference bug in match_hid_uid
Add a non-NULL check to fix potential NULL pointer dereference Cleanup code to call function once. Signed-off-by: Aaron Ma <aaron.ma@canonical.com> Fixes: 2bf9a0a1 ('iommu/amd: Add iommu support for ACPI HID devices') Signed-off-by: Joerg Roedel <jroedel@suse.de>
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