OSM PBF: Fix use of uninitialized value in ReadNode() (normally not triggered by usual pbf files) (Coverity 1073973)

git-svn-id: https://svn.osgeo.org/gdal/trunk@26428 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx