pkcs15-lib: Add return values when select_key_reference is not supported
pkcs15-lib: Add return values when select_key_reference is not supported

LudovicRousseau/OpenSC,dengert/OpenSC,mouse07410/OpenSC,OpenSC/OpenSC,fabled/OpenSC,LudovicRousseau/OpenSC,philipWendland/OpenSC,dengert/OpenSC,mouse07410/OpenSC,philipWendland/OpenSC,dengert/OpenSC,OpenSC/OpenSC,fabled/OpenSC,fabled/OpenSC,mouse07410/OpenSC,philipWendland/OpenSC,metsma/OpenSC,metsma/OpenSC,OpenSC/OpenSC,LudovicRousseau/OpenSC,fabled/OpenSC,metsma/OpenSC