fix dumb bug that caused sign-extension of pointers
fix dumb bug that caused sign-extension of pointers

tyb0807/angr,angr/angr,f-prettyland/angr,f-prettyland/angr,iamahuman/angr,iamahuman/angr,chubbymaggie/simuvex,angr/angr,chubbymaggie/angr,chubbymaggie/simuvex,angr/angr,f-prettyland/angr,axt/angr,chubbymaggie/simuvex,schieb/angr,tyb0807/angr,axt/angr,tyb0807/angr,chubbymaggie/angr,axt/angr,schieb/angr,schieb/angr,iamahuman/angr,angr/simuvex,chubbymaggie/angr