qdisc: fix wrong type info of tc_sfq_qopt

[lwintermelon]

see

netlink/nl/tc_linux.go

Lines 1132 to 1146 in 9d88d83

	// struct tc_sfq_qopt {
	// unsigned quantum; /* Bytes per round allocated to flow */
	// int perturb_period; /* Period of hash perturbation */
	// __u32 limit; /* Maximal packets in queue */
	// unsigned divisor; /* Hash divisor */
	// unsigned flows; /* Maximal number of flows */
	// };
	type TcSfqQopt struct {
	Quantum uint8
	Perturb int32
	Limit uint32
	Divisor uint8
	Flows uint8
	}

[aboch]

LGTM