r0 = socket$inet6_udplite(0xa, 0x2, 0x88)
ioctl$sock_inet6_SIOCDELRT(r0, 0x890c, &(0x7f0000000100)={@mcast2, @dev, @private0, 0x0, 0x75f, 0x0, 0x0, 0x0, 0x1060208})