usb: mtu3: Handle return value of clk_prepare_enable

clk_prepare_enable() can fail here and we must check its return value.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/mtu3/mtu3_plat.c

@@ -458,6 +458,7 @@ static int __maybe_unused mtu3_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct ssusb_mtk *ssusb = platform_get_drvdata(pdev);
+	int ret;
 
 	dev_dbg(dev, "%s\n", __func__);
 
@@ -465,12 +466,28 @@ static int __maybe_unused mtu3_resume(struct device *dev)
 		return 0;
 
 	ssusb_wakeup_disable(ssusb);
-	clk_prepare_enable(ssusb->sys_clk);
-	clk_prepare_enable(ssusb->ref_clk);
-	ssusb_phy_power_on(ssusb);
+	ret = clk_prepare_enable(ssusb->sys_clk);
+	if (ret)
+		goto err_sys_clk;
+
+	ret = clk_prepare_enable(ssusb->ref_clk);
+	if (ret)
+		goto err_ref_clk;
+
+	ret = ssusb_phy_power_on(ssusb);
+	if (ret)
+		goto err_power_on;
+
 	ssusb_host_enable(ssusb);
 
 	return 0;
+
+err_power_on:
+	clk_disable_unprepare(ssusb->ref_clk);
+err_ref_clk:
+	clk_disable_unprepare(ssusb->sys_clk);
+err_sys_clk:
+	return ret;
 }
 
 static const struct dev_pm_ops mtu3_pm_ops = {