fix warning in RMiniFile.cxx
fix warning in RMiniFile.cxx

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