usb: chipidea: usb2: make clock optional

Allow clock to be missing from DT (assume it's enabled then).
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

drivers/usb/chipidea/ci_hdrc_usb2.c

@@ -64,14 +64,15 @@ static int ci_hdrc_usb2_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	priv->clk = devm_clk_get(dev, NULL);
-	if (!IS_ERR(priv->clk)) {
+	priv->clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(priv->clk))
+		return PTR_ERR(priv->clk);;
+
 	ret = clk_prepare_enable(priv->clk);
 	if (ret) {
 		dev_err(dev, "failed to enable the clock: %d\n", ret);
 		return ret;
 	}
-	}
 
 	ci_pdata->name = dev_name(dev);
 
@@ -94,7 +95,6 @@ static int ci_hdrc_usb2_probe(struct platform_device *pdev)
 	return 0;
 
 clk_err:
-	if (!IS_ERR(priv->clk))
 	clk_disable_unprepare(priv->clk);
 	return ret;
 }