[utils] oscap: prevent NULL dereference
[utils] oscap: prevent NULL dereference

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