Fixup handling of simprocedures
Fixup handling of simprocedures

Since a.bbl_addr was -1 instead of None, changed the condition to check for a.sim_procedure's existence

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