minor optimisation ... avoid unnecessary retain/release


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@38187 72102866-910b-0410-8b05-ffd578937521
Patches by Sergei Golovin


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@38188 72102866-910b-0410-8b05-ffd578937521