tipc: Fix null pointer dereference in debug code

This patch eliminates an obsolete use of the DBG_OUTPUT print
buffer which could lead to a null pointer crash in tipc_printf()
if TIPC's debugging capabilities are configured.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/tipc/name_distr.c

@@ -41,9 +41,6 @@
 #include "msg.h"
 #include "name_distr.h"
 
-#undef  DBG_OUTPUT
-#define DBG_OUTPUT NULL
-
 #define ITEM_SIZE sizeof(struct distr_item)
 
 /**