avoid integer underflow
avoid integer underflow

Jakuje/OpenSC,metsma/OpenSC,dengert/OpenSC,viktorTarasov/OpenSC-SM,frankmorgner/OpenSC,OpenSC/OpenSC,mouse07410/OpenSC,viktorTarasov/OpenSC-SM,CardContact/OpenSC,frankmorgner/OpenSC,philipWendland/OpenSC,AktivCo/OpenSC,viktorTarasov/OpenSC-SM,AktivCo/OpenSC,hongquan/OpenSC-main,LudovicRousseau/OpenSC,CardContact/OpenSC,fabled/OpenSC,hongquan/OpenSC-main,fabled/OpenSC,hhonkanen/OpenSC,frankmorgner/OpenSC,mtrojnar/OpenSC,AktivCo/OpenSC,CardContact/OpenSC,hhonkanen/OpenSC,hhonkanen/OpenSC,fabled/OpenSC,dengert/OpenSC,LudovicRousseau/OpenSC,metsma/OpenSC,LudovicRousseau/OpenSC,philipWendland/OpenSC,mtrojnar/OpenSC,Jakuje/OpenSC,dengert/OpenSC,rickyepoderi/OpenSC,OpenSC/OpenSC,metsma/OpenSC,philipWendland/OpenSC,rickyepoderi/OpenSC,mouse07410/OpenSC,mouse07410/OpenSC,Jakuje/OpenSC,Jakuje/OpenSC,rickyepoderi/OpenSC,mtrojnar/OpenSC,hongquan/OpenSC-main,OpenSC/OpenSC,frankmorgner/OpenSC,fabled/OpenSC