[media] af9015: use USB core soft_unbind

I think it is better to allow driver finish pending operations and
disconnect device. Killing all ongoing USB transfers could have very
bad effect, even break hardware in worst case.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/af9015.c

@@ -1431,6 +1431,7 @@ static struct usb_driver af9015_usb_driver = {
 	.disconnect = dvb_usbv2_disconnect,
 	.id_table = af9015_id_table,
 	.no_dynamic_id = 1,
+	.soft_unbind = 1,
 };
 
 module_usb_driver(af9015_usb_driver);