[TCP]: Another TAGBITS -> SACKED_ACKED|LOST conversion

Similar to commit 3eec0047, point of this is to avoid
skipping R-bit skbs.
Signed-off-by: NIlpo Jrvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_input.c

@@ -2078,7 +2078,7 @@ static void tcp_update_scoreboard(struct sock *sk)
 			if (!tcp_skb_timedout(sk, skb))
 				break;
 
-			if (!(TCP_SKB_CB(skb)->sacked&TCPCB_TAGBITS)) {
+			if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_SACKED_ACKED|TCPCB_LOST))) {
 				TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
 				tp->lost_out += tcp_skb_pcount(skb);
 				tcp_verify_retransmit_hint(tp, skb);