net: fec_ptp: Use dev_err() instead of pr_err()

dev_err() is more appropriate for printing error messages inside
drivers, so switch to dev_err().

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/fec_ptp.c

@@ -617,7 +617,7 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx)
 	fep->ptp_clock = ptp_clock_register(&fep->ptp_caps, &pdev->dev);
 	if (IS_ERR(fep->ptp_clock)) {
 		fep->ptp_clock = NULL;
-		pr_err("ptp_clock_register failed\n");
+		dev_err(&pdev->dev, "ptp_clock_register failed\n");
 	}
 
 	schedule_delayed_work(&fep->time_keep, HZ);