usb: musb: am35x: fix error return code in am35x_probe()

Fix to return a negative error code from the usb_phy_generic_register()
error handling case instead of 0, as done elsewhere in this function.
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/am35x.c

@@ -510,8 +510,10 @@ static int am35x_probe(struct platform_device *pdev)
 	pdata->platform_ops		= &am35x_ops;
 
 	glue->phy = usb_phy_generic_register();
-	if (IS_ERR(glue->phy))
+	if (IS_ERR(glue->phy)) {
+		ret = PTR_ERR(glue->phy);
 		goto err7;
+	}
 	platform_set_drvdata(pdev, glue);
 
 	pinfo = am35x_dev_info;