[PATCH] [TCP]: Put back tcp_timer_bug_msg[] symbol export.

This wrecks the ipv6 modular build for a lot of people.
In fact, since I always build ipv6 modular I am surprised
I never hit this.  My best guess is that my compiler is
optimizing the reference away, but that can never be
depended upon and the symbol export really is needed.

[TCP]: Put back tcp_timer_bug_msg[] symbol export.

It is needed for tcp_reset_xmit_timer(), which is invoked by
tcp_prequeue() which is invoked from tcp_ipv6.c
Signed-off-by: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/ipv4/tcp_timer.c

@@ -38,6 +38,7 @@ static void tcp_keepalive_timer (unsigned long data);
 
 #ifdef TCP_DEBUG
 const char tcp_timer_bug_msg[] = KERN_DEBUG "tcpbug: unknown timer value\n";
+EXPORT_SYMBOL(tcp_timer_bug_msg);
 #endif
 
 /*