net: mv643xx_eth: use managed devm_ioremap for port registers

Make use of managed devm_ioremap and remove corresponding iounmap.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 8124464..3417847 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2470,7 +2470,7 @@
 	if (msp == NULL)
 		return -ENOMEM;
 
-	msp->base = ioremap(res->start, resource_size(res));
+	msp->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 	if (msp->base == NULL)
 		return -ENOMEM;
 
@@ -2498,7 +2498,6 @@
 {
 	struct mv643xx_eth_shared_private *msp = platform_get_drvdata(pdev);
 
-	iounmap(msp->base);
 	if (!IS_ERR(msp->clk))
 		clk_disable_unprepare(msp->clk);