s_cc: fix SimCCdecl matching
s_cc: fix SimCCdecl matching

We expect that there is no reg arguments, not that there is no stack
arguments.

It fixes a typo.

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