clint.py: don't print `--help` output to stderr and exit 1

a) It's not an error
b) It requires manual redirection of stderr into stdout ('2>&1') in
   order to be viewed with a pager, which it warrants given how long the
   help message is.

Helped-by: Florian Walch <florian@fwalch.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/clint.py b/clint.py
index ccf1c11c3d..9715edd54e 100755
--- a/clint.py
+++ b/clint.py
@@ -3079,11 +3079,12 @@ def PrintUsage(message):
     Args:
       message: The optional error message.
     """
-    sys.stderr.write(_USAGE)
     if message:
+        sys.stderr.write(_USAGE)
         sys.exit('\nFATAL ERROR: ' + message)
     else:
-        sys.exit(1)
+        sys.stdout.write(_USAGE)
+        sys.exit(0)
 
 
 def PrintCategories():
@@ -3091,7 +3092,7 @@ def PrintCategories():
 
     These are the categories used to filter messages via --filter.
     """
-    sys.stderr.write(''.join('  %s\n' % cat for cat in _ERROR_CATEGORIES))
+    sys.stdout.write(''.join('  %s\n' % cat for cat in _ERROR_CATEGORIES))
     sys.exit(0)