powerpc: Use PTR_RET instead of IS_ERR/PTR_ERR

Signed-off-by: Adrian-Leonard Radu <ady8radu@gmail.com>
Acked-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

arch/powerpc/kernel/iommu.c

@@ -102,7 +102,7 @@ static int __init fail_iommu_debugfs(void)
 	struct dentry *dir = fault_create_debugfs_attr("fail_iommu",
 						       NULL, &fail_iommu);
 
-	return IS_ERR(dir) ? PTR_ERR(dir) : 0;
+	return PTR_RET(dir);
 }
 late_initcall(fail_iommu_debugfs);