test_scanf: Fix the Checker logic.
test_scanf: Fix the Checker logic.

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