[OVAL] fix a memleak
[OVAL] fix a memleak

ybznek/openscap,jan-cerny/openscap,mpreisler/openscap,jan-cerny/openscap,Hexadorsimal/openscap,ybznek/openscap,redhatrises/openscap,Hexadorsimal/openscap,postfix/openscap,mpreisler/openscap,postfix/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,openprivacy/openscap,isimluk/openscap,OpenSCAP/openscap,isimluk/openscap,ybznek/openscap,mpreisler/openscap,jan-cerny/openscap,ybznek/openscap,ybznek/openscap,Hexadorsimal/openscap,Hexadorsimal/openscap,postfix/openscap,postfix/openscap,OpenSCAP/openscap,isimluk/openscap,redhatrises/openscap,isimluk/openscap,redhatrises/openscap,OpenSCAP/openscap,openprivacy/openscap,mpreisler/openscap,openprivacy/openscap,isimluk/openscap,redhatrises/openscap,OpenSCAP/openscap,redhatrises/openscap,jan-cerny/openscap,openprivacy/openscap,mpreisler/openscap,ybznek/openscap,jan-cerny/openscap,jan-cerny/openscap,OpenSCAP/openscap,postfix/openscap,openprivacy/openscap,isimluk/openscap,openprivacy/openscap,postfix/openscap,redhatrises/openscap,mpreisler/openscap,Hexadorsimal/openscap