net_sched: htb: fix a typo in htb_change_class()

Fix a typo added in commit 56b765b7 ("htb: improved accuracy at high
rates")

cbuffer should not be a copy of buffer.
Signed-off-by: NVimalkumar <j.vimal@gmail.com>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Jiri Pirko <jpirko@redhat.com>
Reviewed-by: NJiri Pirko <jiri@resnulli.us>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sched/sch_htb.c

@@ -1495,7 +1495,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 	psched_ratecfg_precompute(&cl->ceil, &hopt->ceil);
 
 	cl->buffer = PSCHED_TICKS2NS(hopt->buffer);
-	cl->cbuffer = PSCHED_TICKS2NS(hopt->buffer);
+	cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer);
 
 	sch_tree_unlock(sch);