avoid divide by zero while setting geotransform on 1xn or nx1 grib file, #5532

git-svn-id: https://svn.osgeo.org/gdal/trunk@27464 f0d54148-0727-0410-94bb-9a71ac55c965
add ticket reference in comment

git-svn-id: https://svn.osgeo.org/gdal/trunk@27466 f0d54148-0727-0410-94bb-9a71ac55c965
minor grammar correction.

git-svn-id: https://svn.osgeo.org/gdal/trunk@27467 f0d54148-0727-0410-94bb-9a71ac55c965