Prevent double/deletion in RooMappedCategory::Entry
Prevent double/deletion in RooMappedCategory::Entry

In assign operator _regexp object was deleted, but pointer not removed
root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root