sch_tbf: Remove bogus semicolon in if() conditional.

Fixes: 49b49971 ("net: sched: make default fifo qdiscs appear in the dump")
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sched/sch_tbf.c

@@ -396,7 +396,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt)
 					  q->qdisc->qstats.backlog);
 		qdisc_destroy(q->qdisc);
 		q->qdisc = child;
-		if (child != &noop_qdisc);
+		if (child != &noop_qdisc)
 			qdisc_hash_add(child, true);
 	}
 	q->limit = qopt->limit;