Python sample scripts: make --version return 0 for gdal_cp/gdal_ls/gdal_rm/gdal_rmdir.py

Fixes OSGeo#11550

Author: rouault

swig/python/gdal-utils/osgeo_utils/samples/gdal_cp.py

@@ -171,7 +171,7 @@ def gdal_cp(argv, progress=None):
 
     argv = gdal.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return -1
+        return 0
 
     for i in range(1, len(argv)):
         if argv[i] == "-progress":

swig/python/gdal-utils/osgeo_utils/samples/gdal_ls.py

@@ -202,7 +202,7 @@ def gdal_ls(argv, fout=sys.stdout):
 
     argv = gdal.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return -1
+        return 0
 
     i = 1
     argc = len(argv)

swig/python/gdal-utils/osgeo_utils/samples/gdal_rm.py

@@ -64,7 +64,7 @@ def gdal_rm(argv, progress=None):
 
     argv = gdal.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return -1
+        return 0
 
     for i in range(1, len(argv)):
         if not argv[i]:

swig/python/gdal-utils/osgeo_utils/samples/gdal_rmdir.py

@@ -28,7 +28,7 @@ def gdal_rm(argv, progress=None):
 
     argv = gdal.GeneralCmdLineProcessor(argv)
     if argv is None:
-        return -1
+        return 0
 
     for i in range(1, len(argv)):
         if argv[i] == "-r":