Python utilities: make gdal_edit, gdal_pansharp, gdal_retile and ogr_…

…layer_algebra return 0 error code when invoked with --version switch

Fixes conda-forge/gdal-feedstock#835 (review)

swig/python/gdal-utils/osgeo_utils/gdal_edit.py

@@ -89,7 +89,7 @@ def gdal_edit(argv):
 
     argv = gdal.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return 2
+        return 0
 
     datasetname = None
     srs = None

swig/python/gdal-utils/osgeo_utils/gdal_pansharpen.py

@@ -71,7 +71,7 @@ def Usage(isError):
 def main(argv=sys.argv):
     argv = gdal.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return -1
+        return 0
 
     pan_name = None
     spectral_names = []

swig/python/gdal-utils/osgeo_utils/gdal_retile.py

@@ -948,7 +948,7 @@ def main(args=None, g=None):
         args = sys.argv
     argv = gdal.GeneralCmdLineProcessor(args)
     if argv is None:
-        return 1
+        return 0
 
     # Parse command line arguments.
     i = 1

swig/python/gdal-utils/osgeo_utils/ogr_layer_algebra.py

@@ -193,7 +193,7 @@ def main(argv=sys.argv):
 
     argv = ogr.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return 1
+        return 0
 
     # Parse command line arguments.
     i = 1

swig/python/gdal-utils/osgeo_utils/ogrmerge.py

@@ -1209,7 +1209,7 @@ def are_sources_gpkg():
 def main(argv=sys.argv):
     argv = ogr.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return 1
+        return 0
     return process(argv[1:])