net_sched: sch_fq: remove one obsolete check in fq_dequeue()

After commit eeb84aa0 ("net_sched: sch_fq: do not assume EDT
packets are ordered"), all skbs get a non zero time_to_send
in flow_queue_add()

This means @time_next_packet variable in fq_dequeue()
can no longer be zero.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_fq.c

@@ -530,8 +530,7 @@ static struct sk_buff *fq_dequeue(struct Qdisc *sch)
 			fq_flow_set_throttled(q, f);
 			goto begin;
 		}
-		if (time_next_packet &&
-		    (s64)(now - time_next_packet - q->ce_threshold) > 0) {
+		if ((s64)(now - time_next_packet - q->ce_threshold) > 0) {
 			INET_ECN_set_ce(skb);
 			q->stat_ce_mark++;
 		}