[TCP]: Remove unnecessary wrapper tcp_packets_out_dec

Makes caller side more obvious, there's no need to have
a wrapper for this oneliner!

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -626,12 +626,6 @@ static inline void tcp_packets_out_inc(struct sock *sk,
 					  inet_csk(sk)->icsk_rto, TCP_RTO_MAX);
 }
 
-static inline void tcp_packets_out_dec(struct tcp_sock *tp, 
-				       const struct sk_buff *skb)
-{
-	tp->packets_out -= tcp_skb_pcount(skb);
-}
-
 /* Events passed to congestion control interface */
 enum tcp_ca_event {
 	CA_EVENT_TX_START,	/* first transmit when no packets in flight */

net/ipv4/tcp_input.c

@@ -2569,7 +2569,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
 			last_ackt = skb->tstamp;
 		}
 		tcp_dec_pcount_approx(&tp->fackets_out, skb);
-		tcp_packets_out_dec(tp, skb);
+		tp->packets_out -= tcp_skb_pcount(skb);
 		tcp_unlink_write_queue(skb, sk);
 		sk_stream_free_skb(sk, skb);
 		clear_all_retrans_hints(tp);

net/ipv4/tcp_output.c

@@ -1735,7 +1735,7 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m
 		 * it is better to underestimate fackets.
 		 */
 		tcp_dec_pcount_approx(&tp->fackets_out, next_skb);
-		tcp_packets_out_dec(tp, next_skb);
+		tp->packets_out -= tcp_skb_pcount(next_skb);
 		sk_stream_free_skb(sk, next_skb);
 	}
 }