hg-ssh: exit with 255 instead of -1 on error

Unix sh would cast -1 to 255 anyway, but on windows -1 become 0. Better be
explicit with the 255 everywhere.

contrib/hg-ssh

@@ -1,57 +1,57 b''
 #!/usr/bin/env python
 #
 # Copyright 2005-2007 by Intevation GmbH <[e-mail]>
 #
 # Author(s):
 # Thomas Arendsen Hein <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 """
 hg-ssh - a wrapper for ssh access to a limited set of mercurial repos
 
 To be used in ~/.ssh/authorized_keys with the "command" option, see sshd(8):
 command="hg-ssh path/to/repo1 /path/to/repo2 ~/repo3 ~user/repo4" ssh-dss ...
 (probably together with these other useful options:
  no-port-forwarding,no-X11-forwarding,no-agent-forwarding)
 
 This allows pull/push over ssh from/to the repositories given as arguments.
 
 If all your repositories are subdirectories of a common directory, you can
 allow shorter paths with:
 command="cd path/to/my/repositories && hg-ssh repo1 subdir/repo2"
 
 You can use pattern matching of your normal shell, e.g.:
 command="cd repos && hg-ssh user/thomas/* projects/{mercurial,foo}"
 """
 
 # enable importing on demand to reduce startup time
 from mercurial import demandimport; demandimport.enable()
 
 from mercurial import dispatch
 
 import sys, os, shlex
 
 cwd = os.getcwd()
 allowed_paths = [os.path.normpath(os.path.join(cwd, os.path.expanduser(path)))
                  for path in sys.argv[1:]]
 orig_cmd = os.getenv('SSH_ORIGINAL_COMMAND', '?')
 try:
     cmdargv = shlex.split(orig_cmd)
 except ValueError, e:
     sys.stderr.write('Illegal command "%s": %s\n' % (orig_cmd, e))
-    sys.exit(-1)
+    sys.exit(255)
 
 if cmdargv[:2] == ['hg', '-R'] and cmdargv[3:] == ['serve', '--stdio']:
     path = cmdargv[2]
     repo = os.path.normpath(os.path.join(cwd, os.path.expanduser(path)))
     if repo in allowed_paths:
         dispatch.dispatch(dispatch.request(['-R', repo, 'serve', '--stdio']))
     else:
         sys.stderr.write('Illegal repository "%s"\n' % repo)
-        sys.exit(-1)
+        sys.exit(255)
 else:
     sys.stderr.write('Illegal command "%s"\n' % orig_cmd)
-    sys.exit(-1)
+    sys.exit(255)