[media] drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c: remove unnecessary null test before usb_free_urb

Fix checkpatch warning:
WARNING: usb_free_urb(NULL) is safe this check is probably not required

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c

@@ -791,8 +791,7 @@ static void ttusb_free_iso_urbs(struct ttusb *ttusb)
 	int i;
 
 	for (i = 0; i < ISO_BUF_COUNT; i++)
-		if (ttusb->iso_urb[i])
-			usb_free_urb(ttusb->iso_urb[i]);
+		usb_free_urb(ttusb->iso_urb[i]);
 
 	pci_free_consistent(NULL,
 			    ISO_FRAME_SIZE * FRAMES_PER_ISO_BUF *