iommu/mediatek: Fix handling of of_count_phandle_with_args result

Author: Andrzej Hajda <>

The function can return negative value so it should be assigned to signed
variable. The patch changes also type of related i variable to make code
more compact and coherent.

The problem has been detected using patch

Signed-off-by: Andrzej Hajda 
Signed-off-by: Joerg Roedel 
 drivers/iommu/mtk_iommu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index f3c160e..4b9ae64 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -578,8 +578,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 	struct resource         *res;
 	struct component_match  *match = NULL;
 	void                    *protect;
-	unsigned int            i, larb_nr;
-	int                     ret;
+	int                     i, larb_nr, ret;
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)