fix bug: project ignored the results of syscalls
fix bug: project ignored the results of syscalls

zhuyue1314/angr,f-prettyland/angr,cureHsu/angr,haylesr/angr,mingderwang/angr,schieb/angr,cureHsu/angr,mingderwang/angr,haylesr/angr,axt/angr,lowks/angr,GuardianRG/angr,chubbymaggie/angr,avain/angr,xurantju/angr,avain/angr,schieb/angr,tyb0807/angr,f-prettyland/angr,iamahuman/angr,iamahuman/angr,terry2012/angr,f-prettyland/angr,lowks/angr,tyb0807/angr,angr/angr,angr/angr,axt/angr,xurantju/angr,terry2012/angr,axt/angr,fjferrer/angr,angr/angr,zhuyue1314/angr,GuardianRG/angr,chubbymaggie/angr,fjferrer/angr,iamahuman/angr,schieb/angr,tyb0807/angr,chubbymaggie/angr