r0 = socket$inet6_udplite(0xa, 0x2, 0x88)
ioctl$sock_inet6_SIOCDELRT(r0, 0x890c, &(0x7f00000002c0)={@initdev={0xfe, 0x88, '\x00', 0x0, 0x0}, @loopback, @mcast1, 0x0, 0xcf})