usb: mtu3: remove repeated setting of gadget state

The usb_add_gadget_udc() will set the gadget state as
USB_STATE_NOTATTACHED, so we needn't set it again.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/mtu3/mtu3_gadget.c

@@ -660,14 +660,10 @@ int mtu3_gadget_setup(struct mtu3 *mtu)
 	mtu3_gadget_init_eps(mtu);
 
 	ret = usb_add_gadget_udc(mtu->dev, &mtu->g);
-	if (ret) {
+	if (ret)
 		dev_err(mtu->dev, "failed to register udc\n");
-		return ret;
-	}
 
-	usb_gadget_set_state(&mtu->g, USB_STATE_NOTATTACHED);
-
-	return 0;
+	return ret;
 }
 
 void mtu3_gadget_cleanup(struct mtu3 *mtu)