iommu/tegra: smmu: Fix uninitialized var warning

For the compiler warning, uninitizlized var when getting value by a
pointer.

Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index cc6aba4..becfc61 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -902,8 +902,8 @@
 	struct smmu_device *smmu;
 	struct device *dev = &pdev->dev;
 	int i, asids, err = 0;
-	dma_addr_t base;
-	size_t bytes, size;
+	dma_addr_t uninitialized_var(base);
+	size_t bytes, uninitialized_var(size);
 
 	if (smmu_handle)
 		return -EIO;