[DF][NFC] More readable variable declaration
[DF][NFC] More readable variable declaration

Co-authored-by: Axel Naumann <cb9efc8f9015dd95c88a8e735ee07ab4f1027cd2@cern.ch>
root-mirror/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root