phy: ti: Fix not calling dev_err with a device

`phy` doesn't exist; we need to use `x` instead.
Signed-off-by: NSean Anderson <seanga2@gmail.com>
Tested-by: NPatrick Delaunay <patrick.delaunay@st.com>

drivers/phy/phy-ti-am654.c

@@ -318,13 +318,13 @@ static int serdes_am654_of_xlate(struct phy *x,
 	struct serdes_am654 *phy = dev_get_priv(x->dev);
 
 	if (args->args_count != 2) {
-		dev_err(phy->dev, "Invalid DT PHY argument count: %d\n",
+		dev_err(x->dev, "Invalid DT PHY argument count: %d\n",
 			args->args_count);
 		return -EINVAL;
 	}
 
 	if (args->args[0] != PHY_TYPE_PCIE) {
-		dev_err(phy->dev, "Unrecognized PHY type: %d\n",
+		dev_err(x->dev, "Unrecognized PHY type: %d\n",
 			args->args[0]);
 		return -EINVAL;
 	}