usb: mtu3: fix error code for getting extcon device

When failing to get extcon device, extcon_get_edev_by_phandle()
may return different error codes, but not only -EPROBE_DEFER,
so can't always return -EPROBE_DEFER, and fix it.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/mtu3/mtu3_plat.c

@@ -308,7 +308,7 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
 		otg_sx->edev = extcon_get_edev_by_phandle(ssusb->dev, 0);
 		if (IS_ERR(otg_sx->edev)) {
 			dev_err(ssusb->dev, "couldn't get extcon device\n");
-			return -EPROBE_DEFER;
+			return PTR_ERR(otg_sx->edev);
 		}
 	}