[PATCH] iommu: sprd: Fix parameter type warning

[Chunyan Zhang]

From: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>

The second parameter of clk_get_optional() is "const char *", so use NULL
instead of integer 0 to fix a sparse warning like:

">> drivers/iommu/sprd-iommu.c:456:42: sparse: sparse: Using plain integer as NULL pointer"

Also this patch changes to use the resource-managed variant of
clk_get_optional(), then there's no need to add clk_put() which
is missed in the current driver.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx>
---
 drivers/iommu/sprd-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index 7100ed17dcce..371d5715cbc9 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -453,7 +453,7 @@ static int sprd_iommu_clk_enable(struct sprd_iommu_device *sdev)
 {
 	struct clk *eb;
 
-	eb = clk_get_optional(sdev->dev, 0);
+	eb = devm_clk_get_optional(sdev->dev, NULL);
 	if (!eb)
 		return 0;
 
-- 
2.25.1