Fix a gcc-3.4 build failure and gcc-3.3 build warnings with TCP_DEBUG
disabled in tcp.h

TCP_DEBUG is default on, but it should work with it off anyway.

With gcc-3.4:
  CC      net/core/sock.o
In file included from net/core/sock.c:127:
include/net/tcp.h: In function `tcp_reset_xmit_timer':
include/net/tcp.h:1042: error: label at end of compound statement
make[3]: *** [net/core/sock.o] Error 1
make[2]: *** [net/core] Error 2
make[1]: *** [net] Error 2
make[1]: Leaving directory `/build/kernel/linux-2.6.11-s3'
make: *** [stamp-build] Error 2

With gcc-3.3:
In file included from net/ipv4/icmp.c:84:
include/net/tcp.h: In function `tcp_reset_xmit_timer':
include/net/tcp.h:1042: warning: deprecated use of label at end of compound statement
(times everywhere tcp.h is included)

Signed-off-by: Andre Tomt <andre@tomt.net>

diff -Naur linux-2.6.11/include/net/tcp.h linux-2.6.11-1.1/include/net/tcp.h
--- linux-2.6.11/include/net/tcp.h	2005-03-02 08:37:48.000000000 +0100
+++ linux-2.6.11-1.1/include/net/tcp.h	2005-03-12 07:00:52.000000000 +0100
@@ -1039,6 +1039,7 @@
 #ifdef TCP_DEBUG
 		printk(tcp_timer_bug_msg);
 #endif
+		return;
 	};
 }