iommu/tegra-smmu: Fix missing put_device() call in tegra_smmu_find

The reference taken by 'of_find_device_by_node()' must be released when
not needed anymore.
Add the corresponding 'put_device()' in the error handling path.

Fixes: 765a9d1d ("iommu/tegra-smmu: Fix mc errors on tegra124-nyan")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20220107080915.12686-1-linmq006@gmail.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/tegra-smmu.c

@@ -808,8 +808,10 @@ static struct tegra_smmu *tegra_smmu_find(struct device_node *np)
 		return NULL;
 
 	mc = platform_get_drvdata(pdev);
-	if (!mc)
+	if (!mc) {
+		put_device(&pdev->dev);
 		return NULL;
+	}
 
 	return mc->smmu;
 }