When CONFIG_OF=n of_match_device() gets pre-processed out of existence
leaving qcom-smmu_client_of_match unused. Mark it as possibly unused to
keep the compiler from warning in that case.

Fixes: 0e764a01015d ("iommu/arm-smmu: Allow client devices to select direct 
mapping")
Reported-by: kbuild test robot <l...@intel.com>
Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
---

 drivers/iommu/arm-smmu-qcom.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/arm-smmu-qcom.c b/drivers/iommu/arm-smmu-qcom.c
index cf01d0215a39..063b4388b0ff 100644
--- a/drivers/iommu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm-smmu-qcom.c
@@ -12,7 +12,7 @@ struct qcom_smmu {
        struct arm_smmu_device smmu;
 };
 
-static const struct of_device_id qcom_smmu_client_of_match[] = {
+static const struct __maybe_unused of_device_id qcom_smmu_client_of_match[] = {
        { .compatible = "qcom,adreno" },
        { .compatible = "qcom,mdp4" },
        { .compatible = "qcom,mdss" },
-- 
2.17.1

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