tcp: cleanup messy initializer

I'm quite sure that if I give this function in its old format
for you to inspect, you start to wonder what is the type of
demanded or if it's a global variable.
Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_input.c

@@ -4461,8 +4461,8 @@ static void tcp_new_space(struct sock *sk)
 
 	if (tcp_should_expand_sndbuf(sk)) {
 		int sndmem = max_t(u32, tp->rx_opt.mss_clamp, tp->mss_cache) +
-			MAX_TCP_HEADER + 16 + sizeof(struct sk_buff),
-		    demanded = max_t(unsigned int, tp->snd_cwnd,
+			MAX_TCP_HEADER + 16 + sizeof(struct sk_buff);
+		int demanded = max_t(unsigned int, tp->snd_cwnd,
 				     tp->reordering + 1);
 		sndmem *= 2 * demanded;
 		if (sndmem > sk->sk_sndbuf)