net: mv643xx_eth: use managed devm_ioremap for port registers

Make use of managed devm_ioremap and remove corresponding iounmap.
Signed-off-by: NSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mv643xx_eth.c

@@ -2470,7 +2470,7 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
 	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 @@ static int mv643xx_eth_shared_remove(struct platform_device *pdev)
 {
 	struct mv643xx_eth_shared_private *msp = platform_get_drvdata(pdev);
 
-	iounmap(msp->base);
 	if (!IS_ERR(msp->clk))
 		clk_disable_unprepare(msp->clk);