Fix compiler warnings in mempool for RooSets.
Fix compiler warnings in mempool for RooSets.

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