[RF] Prevent double deletion of proxied objects.
[RF] Prevent double deletion of proxied objects.

When a RooArgProxy owns its argument, but the proxied object is
redirected, the proxy loses ownership. It was, however still deleting
its argument.

karies/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,karies/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,olifre/root,olifre/root,karies/root,karies/root,olifre/root,olifre/root,root-mirror/root,karies/root,karies/root,olifre/root,olifre/root,karies/root