isdn/bas_gigaset: use USB API functions rather than constants

This patch introduces the use of the function usb_endpoint_num.

The Coccinelle semantic patch that makes these changes is as follows:

@@ struct usb_endpoint_descriptor *epd; @@

- (epd->bEndpointAddress & \(USB_ENDPOINT_NUMBER_MASK\|0x0f\))
+ usb_endpoint_num(epd)
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Acked-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/gigaset/bas-gigaset.c

@@ -2365,7 +2365,7 @@ static int gigaset_probe(struct usb_interface *interface,
 	endpoint = &hostif->endpoint[0].desc;
 	usb_fill_int_urb(ucs->urb_int_in, udev,
 			 usb_rcvintpipe(udev,
-					(endpoint->bEndpointAddress) & 0x0f),
+					usb_endpoint_num(endpoint)),
 			 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
 			 endpoint->bInterval);
 	rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);