ks8851: Fix typo in regulator code

Disable the correct regulators on exit or probe failure.

Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
diff --git a/drivers/net/ks8851.c b/drivers/net/ks8851.c
index a3aa860..8e4f4ff 100644
--- a/drivers/net/ks8851.c
+++ b/drivers/net/ks8851.c
@@ -1706,7 +1706,7 @@
 	free_netdev(ndev);
 
 	if (!IS_ERR(ks->vdd_io)) {
-		regulator_disable(ks->vdd_phy);
+		regulator_disable(ks->vdd_io);
 		regulator_put(ks->vdd_io);
 	}
 
@@ -1725,7 +1725,7 @@
 		dev_info(&spi->dev, "remove\n");
 
 	if (!IS_ERR(priv->vdd_io)) {
-		regulator_disable(priv->vdd_phy);
+		regulator_disable(priv->vdd_io);
 		regulator_put(priv->vdd_io);
 	}