l2tp: fix missing line continuation

This syntax error was covered by L2TP_REFCNT_DEBUG not being set by
default.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 797c0af..2aa2b6c 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -148,7 +148,7 @@
 		 atomic_read(&_t->ref_count));				\
 	l2tp_tunnel_inc_refcount_1(_t);					\
 } while (0)
-#define l2tp_tunnel_dec_refcount(_t)
+#define l2tp_tunnel_dec_refcount(_t)					\
 do {									\
 	pr_debug("l2tp_tunnel_dec_refcount: %s:%d %s: cnt=%d\n",	\
 		 __func__, __LINE__, (_t)->name,			\