initialize intercept callback to NULL
initialize intercept callback to NULL

michalslonina/enet,shumtn/enet,elliotwhisper/enet,airtame/enet,kitech/enet,lsalzman/enet,nicolaichuk/enet,shumtn/enet,wangscript/enet,eisenhauer/enet,alexxvk/enet,elliotwhisper/enet,kitech/enet,airtame/enet,stiljg/enet,stiljg/enet,michalslonina/enet,chenbk85/enet,eisenhauer/enet,wangscript/enet,nicolaichuk/enet,chenbk85/enet,freeminer/enet,eisenhauer/enet,alexxvk/enet,freeminer/enet