[PATCH -next v3] iommu/exynos: Fix return value check in exynos_iommu_of_setup()

[weiyj_lk at 163.com]

From: Wei Yongjun <yongjun_wei at trendmicro.com.cn>

In case of error, the function of_platform_device_create() returns
NULL pointer not ERR_PTR(). The IS_ERR() test in the return value
check should be replaced with NULL test.

Fixes: 8ed55c812fa8 ("iommu/exynos: Init from dt-specific callback
instead of initcall")
Cc: stable at vger.kernel.org
Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
Reviewed-by: Andi Shyti <andi.shyti at samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
Reviewed-by: Dennis Chen <dennis.chen at arm.com>
---
v2 -> v3: added fixes and Reviewed-by.
---
 drivers/iommu/exynos-iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 33dcc29..9b23059 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1345,8 +1345,8 @@ 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 -ENODEV;
 
 	/*
 	 * use the first registered sysmmu device for performing