Internal libtiff: fix segfault on invalid JPEG-in-TIFF (http://bugzilla.maptools.org/show_bug.cgi?id=2471)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27251 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx