coverity: Add allocation check
coverity: Add allocation check

 *** CID 323588:  Uninitialized variables  (UNINIT)
/src/libopensc/sc.c: 873 in sc_mem_secure_alloc()

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