USB: appledisplay: refactor endpoint retrieval

Use the new endpoint helpers to lookup the required interrupt-in
endpoint.

Note that the default retval was never used.
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/misc/appledisplay.c

@@ -212,28 +212,21 @@ static int appledisplay_probe(struct usb_interface *iface,
 	struct backlight_properties props;
 	struct appledisplay *pdata;
 	struct usb_device *udev = interface_to_usbdev(iface);
-	struct usb_host_interface *iface_desc;
 	struct usb_endpoint_descriptor *endpoint;
 	int int_in_endpointAddr = 0;
-	int i, retval = -ENOMEM, brightness;
+	int retval, brightness;
 	char bl_name[20];
 
 	/* set up the endpoint information */
 	/* use only the first interrupt-in endpoint */
-	iface_desc = iface->cur_altsetting;
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
-		endpoint = &iface_desc->endpoint[i].desc;
-		if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
-			/* we found an interrupt in endpoint */
-			int_in_endpointAddr = endpoint->bEndpointAddress;
-			break;
-		}
-	}
-	if (!int_in_endpointAddr) {
+	retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint);
+	if (retval) {
 		dev_err(&iface->dev, "Could not find int-in endpoint\n");
-		return -EIO;
+		return retval;
 	}
 
+	int_in_endpointAddr = endpoint->bEndpointAddress;
+
 	/* allocate memory for our device state and initialize it */
 	pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
 	if (!pdata) {