iommu/vt-d: Simplify check in identity_mapping()
The function only has one call-site and there it is never called with dummy or deferred devices. Simplify the check in the function to account for that. Fixes: 1ee0186b ("iommu/vt-d: Refactor find_domain() helper") Cc: stable@vger.kernel.org # v5.5 Reviewed-by: NJerry Snitselaar <jsnitsel@redhat.com> Acked-by: NLu Baolu <baolu.lu@linux.intel.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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