usbtouchscreen: use endpoint address from endpoint descriptor

use the endpoint address from the endpoint descriptor instead of the hardcoding
it to 0x81. at least some ITM based screen use a different address and don't work
without this.

Signed-off-by: Daniel Ritz <[e-mail]>
Cc: Ralf Lehmann <[e-mail]>
Cc: J.P. Delport <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/input/usbtouchscreen.c

···
 		                     type->max_press, 0, 0);
 
 	usb_fill_int_urb(usbtouch->irq, usbtouch->udev,
-			 usb_rcvintpipe(usbtouch->udev, 0x81),
+			 usb_rcvintpipe(usbtouch->udev, endpoint->bEndpointAddress),
 			 usbtouch->data, type->rept_size,
 			 usbtouch_irq, usbtouch, endpoint->bInterval);