opensc: Double free handling responses from smartcards in libopensc/sc.c:sc_file_set_sec_attr()

A double free when handling responses from a smartcard in scfilesetsecattr in libopensc/sc.c in OpenSC before 0.19.0-rc1 could be used by attackers able to supply crafted smartcards to cause a denial of service application crash or possibly have unspecified other impact...