Fixed a memory leak, introduced Stable_free.
Fixed a memory leak, introduced Stable_free.

Stable_free complements Stable_new.

OpenSCAP/openscap,redhatrises/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,jan-cerny/openscap,OpenSCAP/openscap,redhatrises/openscap,redhatrises/openscap,OpenSCAP/openscap,jan-cerny/openscap,jan-cerny/openscap,redhatrises/openscap,jan-cerny/openscap,OpenSCAP/openscap,OpenSCAP/openscap