[patch] iommu/exynos: checking for IS_ERR() instead of NULL

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of_platform_device_create() returns NULL on error, it never returns
error pointers.

Fixes: 8ed55c812fa8 ('iommu/exynos: Init from dt-specific callback instead of initcall')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index b066504..cb57bda 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1347,8 +1347,8 @@ static int __init exynos_iommu_of_setup(struct device_node *np)
 		exynos_iommu_init();
 
 	pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root);
-	if (IS_ERR(pdev))
-		return PTR_ERR(pdev);
+	if (!pdev)
+		return -ENOMEM;
 
 	/*
 	 * use the first registered sysmmu device for performing
--
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