[media] dvb_usb_v2: do not try to remove non-existent adapter

Check that adapter exists before trying to remove it.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dvb_usb_core.c

@@ -717,9 +717,11 @@ static int dvb_usbv2_adapter_exit(struct dvb_usb_device *d)
 	dev_dbg(&d->udev->dev, "%s:\n", __func__);
 
 	for (i = MAX_NO_OF_ADAPTER_PER_DEVICE - 1; i >= 0; i--) {
-		dvb_usbv2_adapter_frontend_exit(&d->adapter[i]);
-		dvb_usbv2_adapter_dvb_exit(&d->adapter[i]);
-		dvb_usbv2_adapter_stream_exit(&d->adapter[i]);
+		if (d->adapter[i].props) {
+			dvb_usbv2_adapter_frontend_exit(&d->adapter[i]);
+			dvb_usbv2_adapter_dvb_exit(&d->adapter[i]);
+			dvb_usbv2_adapter_stream_exit(&d->adapter[i]);
+		}
 	}
 
 	return 0;