fix return exit value, shared libs cannot use exit, but return instead
fix return exit value, shared libs cannot use exit, but return instead

jiangbing9293/binwalk,foreni-packages/binwalk,sundhaug92/binwalk,Eih3/binwalk,ddcc/binwalk,sviehb/binwalk,pombredanne/binwalk,UniqMartin/binwalk,anthraxx/binwalk,jiangbing9293/binwalk,chubbymaggie/binwalk,draekko/binwalk,sviehb/binwalk,Eih3/binwalk,cappiewu/binwalk,AmesianX/binwalk,cristianst85/binwalk,thx0701/binwalk,anthraxx/binwalk,pyq881120/binwalk,hyper-xx/binwalk,chubbymaggie/binwalk,draekko/binwalk,gale320/binwalk,zhuyue1314/binwalk,Flameeyes/binwalk,MaiPhuoc/binwalk,naterh/binwalk,peterdocter/binwalk,UniqMartin/binwalk,hyper-xx/binwalk,MaiPhuoc/binwalk,peterdocter/binwalk,0x7678/binwalk,zhuyue1314/binwalk,WooyunDota/binwalk,Flameeyes/binwalk,pyq881120/binwalk,cappiewu/binwalk,AmesianX/binwalk,geekspeed/binwalk,geekspeed/binwalk,ddcc/binwalk,goofwear/binwalk,cristianst85/binwalk,itsens/binwalk,emprovements/binwalk,emprovements/binwalk,WooyunDota/binwalk,foreni-packages/binwalk,devttys0/binwalk,itsens/binwalk,gale320/binwalk,foreni-packages/binwalk,thx0701/binwalk,sundhaug92/binwalk,pombredanne/binwalk,naterh/binwalk,goofwear/binwalk,devttys0/binwalk