Fix warning and avoid triplacated hard coded string

git-svn-id: https://svn.osgeo.org/gdal/trunk@26812 f0d54148-0727-0410-94bb-9a71ac55c965
fix warning

git-svn-id: https://svn.osgeo.org/gdal/trunk@26813 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_with_coverage