remove old/useless usecnt stuff

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47131 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_zap.c

@@ -336,8 +336,6 @@ static int gendigittimeout = 8000;
 /*! \brief How long to wait for an extra digit, if there is an ambiguous match */
 static int matchdigittimeout = 3000;
 
-static int usecnt = 0;
-
 /*! \brief Protect the interface list (of zt_pvt's) */
 AST_MUTEX_DEFINE_STATIC(iflock);
 
@@ -2922,8 +2920,6 @@ static int zt_hangup(struct ast_channel *ast)
 	p->oprmode = 0;
 	ast->tech_pvt = NULL;
 	ast_mutex_unlock(&p->lock);
-	ast_atomic_fetchadd_int(&usecnt, -1);
-	ast_update_use_count();
 	if (option_verbose > 2) 
 		ast_verbose( VERBOSE_PREFIX_3 "Hungup '%s'\n", ast->name);
 
@@ -5658,9 +5654,6 @@ static struct ast_channel *zt_new(struct zt_pvt *i, int state, int startpbx, int
 		}
 	}
 
-	ast_atomic_fetchadd_int(&usecnt, 1);
-	ast_update_use_count();
-	
 	return tmp;
 }