net: sun4i-emac: fix a typo in emac_probe()

Just fixed a typo in emac_probe().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index b411344..26083cd 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -821,7 +821,7 @@
 	db->membase = of_iomap(np, 0);
 	if (!db->membase) {
 		dev_err(&pdev->dev, "failed to remap registers\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
 		goto out;
 	}