TMVA: Prevent stack corruption for user supplied trees.
TMVA: Prevent stack corruption for user supplied trees.

We will be reading the tree, so make sure that the user
did not forget to remove pointers to out-of-scope vars.

The user should *always* call ResetBranchAddresses on their trees
when they are done with them, but in case they forgot this can save
some debugging time at no cost.

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