itacns: Do not leaek memory if file is empty
itacns: Do not leaek memory if file is empty

Thanks oss-fuzz

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25475

frankmorgner/OpenSC,LudovicRousseau/OpenSC,metsma/OpenSC,hongquan/OpenSC-main,AktivCo/OpenSC,fabled/OpenSC,Jakuje/OpenSC,philipWendland/OpenSC,mouse07410/OpenSC,hongquan/OpenSC-main,philipWendland/OpenSC,fabled/OpenSC,mouse07410/OpenSC,LudovicRousseau/OpenSC,OpenSC/OpenSC,fabled/OpenSC,Jakuje/OpenSC,fabled/OpenSC,frankmorgner/OpenSC,Jakuje/OpenSC,frankmorgner/OpenSC,dengert/OpenSC,dengert/OpenSC,dengert/OpenSC,philipWendland/OpenSC,LudovicRousseau/OpenSC,AktivCo/OpenSC,mouse07410/OpenSC,OpenSC/OpenSC,AktivCo/OpenSC,metsma/OpenSC,hongquan/OpenSC-main,OpenSC/OpenSC,Jakuje/OpenSC,metsma/OpenSC,frankmorgner/OpenSC