ipv6: remove dead debug code from ip6_tunnel.c

The IP6_TNL_TRACE macro is no longer used anywhere in the code so remove definition.
Signed-off-by: Ian Morris <ipm@chirality.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_tunnel.c

@@ -64,12 +64,6 @@ MODULE_LICENSE("GPL");
 MODULE_ALIAS_RTNL_LINK("ip6tnl");
 MODULE_ALIAS_NETDEV("ip6tnl0");
 
-#ifdef IP6_TNL_DEBUG
-#define IP6_TNL_TRACE(x...) pr_debug("%s:" x "\n", __func__)
-#else
-#define IP6_TNL_TRACE(x...) do {;} while(0)
-#endif
-
 #define HASH_SIZE_SHIFT  5
 #define HASH_SIZE (1 << HASH_SIZE_SHIFT)