usb: phy: mxs: silence EPROBE_DEFER error on boot

Use dev_err_probe to silence EPROBE_DEFER error on boot on i.MX8ULP:
[ 0.127301] mxs_phy 29910000.usb-phy: can't get the clock, err=-517

Signed-off-by: Dominique Martinet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/phy/phy-mxs-usb.c

···
 		return PTR_ERR(base);
 
 	clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(clk)) {
-		dev_err(&pdev->dev,
-			"can't get the clock, err=%ld", PTR_ERR(clk));
-		return PTR_ERR(clk);
-	}
+	if (IS_ERR(clk))
+		return dev_err_probe(&pdev->dev, PTR_ERR(clk),
+				     "can't get the clock\n");
 
 	mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
 	if (!mxs_phy)