iommu/arm-smmu: Mark qcom_smmu_client_of_match as possibly unused

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: 0e764a0 ("iommu/arm-smmu: Allow client devices to select direct mapping")
Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Jordan Crouse <[email protected]>
Acked-by: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: Jordan Crouse

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 of_device_id qcom_smmu_client_of_match[] __maybe_unused = {
 	{ .compatible = "qcom,adreno" },
 	{ .compatible = "qcom,mdp4" },
 	{ .compatible = "qcom,mdss" },