reader-pcsc.c: fix compiler warning
reader-pcsc.c: fix compiler warning

der-pcsc.c:1101:11: warning: comparison of integers of different signs:
      'LONG' (aka 'int') and 'unsigned int' [-Wsign-compare]
                        if (rv == SCARD_E_NO_SERVICE) {
                            ~~ ^  ~~~~~~~~~~~~~~~~~~

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