r0 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCDELRT(r0, 0x890c, &(0x7f00000002c0)={0x0, {0x2, 0x0, @multicast1}, {0x2, 0x0, @initdev={0xac, 0x1e, 0x0, 0x0}}, {0x2, 0x0, @loopback}, 0x36e})