[TCP]: Fix gcc-3.4 build when TCP_DEBUG is disabled in tcp.h

Signed-off-by: Andre Tomt <andre@tomt.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -1039,6 +1039,7 @@ static inline void tcp_reset_xmit_timer(struct sock *sk, int what, unsigned long
 #ifdef TCP_DEBUG
 		printk(tcp_timer_bug_msg);
 #endif
+		return;
 	};
 }