Shave 40 unused bytes from struct tcpcb.

UPDATING

@@ -23,6 +23,11 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 6.x IS SLOW:
 	developers choose to disable these features on build machines
 	to maximize performance.
 
+20041022:
+	The size of struct tcpcb has changed.  You have to recompile
+	userland programs that read kmem for tcp sockets directly
+	(netstat, sockstat, etc.)
+
 20041018:
 	A major sweep over the tty drivers to elimnate approx 3100
 	lines of copy&pasted code have been performed.  As a part of

sys/netinet/tcp_var.h

@@ -79,7 +79,6 @@ struct tcpcb {
 	struct	tsegqe_head t_segq;	/* segment reassembly queue */
 	int	t_segqlen;		/* segment reassembly queue length */
 	int	t_dupacks;		/* consecutive dup acks recd */
-	struct	tcptemp	*unused;	/* unused */
 
 	struct	callout *tt_rexmt;	/* retransmit timer */
 	struct	callout *tt_persist;	/* retransmit persistence */