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PCITEST_DOORBELL may return -EOPNOTSUPP when the endpoint does not advertise CAP_DYNAMIC_INBOUND_MAPPING. Treat this like other optional capabilities and skip the doorbell test instead of reporting a failure. Suggested-by: Niklas Cassel <cassel@kernel.org> Signed-off-by: Koichiro Den <den@valinux.co.jp> Signed-off-by: Manivannan Sadhasivam <mani@kernel.org> Reviewed-by: Niklas Cassel <cassel@kernel.org> Link: https://patch.msgid.link/20260215150334.3391943-4-den@valinux.co.jp