minor cosmetic fix hwen using a proxy

[SAKIYAMA Nobuo]

I think following patch is better for "TCP_NODELAY on a non-socket"
bug.

Nobuo Sakiyama <nobuo at isl.rdc.toshiba.co.jp>

diff -u packet.c.dist packet.c
--- packet.c.dist       Mon Dec 23 11:42:53 2002
+++ packet.c    Thu Apr  3 18:06:12 2003
@@ -1344,6 +1344,7 @@
 
	/* Only set socket options if using a socket.  */
	if (!packet_connection_is_on_socket())
+		return;
	if (interactive)
		set_nodelay(connection_in);
 #if defined(IP_TOS) && !defined(IP_TOS_IS_BROKEN)