media: stk1160: Use usb_endpoint_is_isoc_in() rather than duplicating its implementation

Reuse existing functionality from usb_endpoint_is_isoc_in() instead of
keeping duplicate source code.

The source code was transformed by using the Coccinelle software.

Signed-off-by: Markus Elfring <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/usb/stk1160/stk1160-core.c

···
 			if (udev->speed == USB_SPEED_HIGH)
 				size = size * hb_mult(sizedescr);
 
-			if (usb_endpoint_xfer_isoc(desc) &&
-			    usb_endpoint_dir_in(desc)) {
+			if (usb_endpoint_is_isoc_in(desc)) {
 				switch (desc->bEndpointAddress) {
 				case STK1160_EP_AUDIO:
 					has_audio = true;