Prevent crash if no permissions on port
Prevent crash if no permissions on port

This fix prevents Gor from crashing at startup if run without proper
permissions for listening on specified port.

no2key/gor,yangzilong1986/gor,yiliaofan/gor,ironsmile/gor,leucos/gor,mre/gor,on99/gor,obbectim/gor,cregev/gor,reeze/gor,dougmoscrop/gor,cemkoc/gor,Amirus/gor,Sk464036801/gor,chinanjjohn2012/gor,treejames/gor-1,jmptrader/gor,sshling/gor,LightCity/gor,jasonchaffee/gor,adriano-io/gor,wxdublin/gor,daodaoliang/gor,chenwenbin928/gor-1,landryshuai/gor,jakubholynet/gor,antonini/gor,sunqk13022/gor,chengky/gor,arothian/gor,davidwalter0/gor,weiyihz/gor,justanshulsharma/gor,jonsie/gor,dshamaeli/gor,bunnyblue/gor,baotingfang/gor,chunshengster/gor,dt/gor,insionng/gor,w4ngyi/gor,limingwei/gor,LiuShulong/gor,MenZil/gor,Neeke/gor,deliangyang/gor,chosen0ne/gor,wfxiang08/gor,torfuzx/gor,qbdsoft/gor,jamesblunt/gor,bkochendorfer/gor