[Bluetooth] Quirk for devices with no ISOC endpoints

This patch checks the existence of ISOC endpoints before it
starts the URB for them.

drivers/bluetooth/hci_usb.c

@@ -303,7 +303,8 @@ static int hci_usb_open(struct hci_dev *hdev)
 			hci_usb_bulk_rx_submit(husb);
 
 #ifdef CONFIG_BT_USB_SCO
-		hci_usb_isoc_rx_submit(husb);
+		if (husb->isoc_iface)
+			hci_usb_isoc_rx_submit(husb);
 #endif
 	} else {
 		clear_bit(HCI_RUNNING, &hdev->flags);