usb: gadget: Use correct endianness of the wLength field for WebUSB

WebUSB code uses wLength directly without proper endianness conversion.
Update it to use already prepared temporary variable w_length instead.

Fixes: 93c47394 ("usb: gadget: add WebUSB landing page support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-By: Jó Ágila Bitsch <jgilab@gmail.com>
Link: https://lore.kernel.org/r/20230313154522.52684-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/composite.c

@@ -2079,10 +2079,9 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 				sizeof(url_descriptor->URL)
 				- WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + landing_page_offset);
 
-			if (ctrl->wLength < WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH
-					    + landing_page_length)
-				landing_page_length = ctrl->wLength
-					- WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + landing_page_offset;
+			if (w_length < WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + landing_page_length)
+				landing_page_length = w_length
+				- WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + landing_page_offset;
 
 			memcpy(url_descriptor->URL,
 				cdev->landing_page + landing_page_offset,