JP2OpenJPEG: avoid 'Empty SOT marker detected: Psot=12.' warning to be repeated several times

git-svn-id: https://svn.osgeo.org/gdal/trunk@26177 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' of github.com:rouault/gdal into trunk_with_coverage