belpic: Remove unused variable
belpic: Remove unused variable

Thanks clang

/src/libopensc/card-belpic.c:230:7: warning: Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' [clang-analyzer-deadcode.DeadStores]
                if((r = get_carddata(card, carddata, sizeof(carddata))) < 0) {
                    ^
/src/libopensc/card-belpic.c:230:7: note: Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r'

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