ipvs: fix timer in get_curr_sync_buff

Fix get_curr_sync_buff to keep buffer for 2 seconds
as intended, not just for the current jiffie. By this way
we will sync more connection structures with single packet.

Signed-off-by: Tinggong Wang <[e-mail]>
Signed-off-by: Julian Anastasov <[e-mail]>
Signed-off-by: Simon Horman <[e-mail]>

net/netfilter/ipvs/ip_vs_sync.c

···
 	struct ip_vs_sync_buff *sb;
 
 	spin_lock_bh(&ipvs->sync_buff_lock);
-	if (ipvs->sync_buff && (time == 0 ||
-	    time_before(jiffies - ipvs->sync_buff->firstuse, time))) {
+	if (ipvs->sync_buff &&
+	    time_after_eq(jiffies - ipvs->sync_buff->firstuse, time)) {
 		sb = ipvs->sync_buff;
 		ipvs->sync_buff = NULL;
 	} else