asn1: Initialize values to avoid comparison with garbage
asn1: Initialize values to avoid comparison with garbage

Reported by clang analyzer:

src/libopensc/asn1.c:2115:14: warning: The right operand of '<' is a garbage value [clang-analyzer-core.UndefinedBinaryOperatorResult]

        if (halflen < r_len || halflen < s_len)   {

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