tun: remove unnecessary check in tun_flow_update

caller has guaranted that rxhash is not zero

Signed-off-by: Li RongQing <[email protected]>
Acked-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: lrq-max

drivers/net/tun.c

@@ -529,10 +529,7 @@ static void tun_flow_update(struct tun_struct *tun, u32 rxhash,
 	unsigned long delay = tun->ageing_time;
 	u16 queue_index = tfile->queue_index;
 
-	if (!rxhash)
-		return;
-	else
-		head = &tun->flows[tun_hashfn(rxhash)];
+	head = &tun->flows[tun_hashfn(rxhash)];
 
 	rcu_read_lock();