only use perror if ENET_DEBUG defined
only use perror if ENET_DEBUG defined

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