* lib/exitcodes.h: Define E_SUCCESS as EXIT_SUCCESS. Added FIXMEs.

* libmisc/chowntty.c, libmisc/rlogin.c, libmisc/sub.c,
	src/newusers.c, libmisc/sulog.c, libmisc/system.c, src/logoutd.c,
	src/groups.c, src/id.c, lib/encrypt.c, libmisc/audit_help.c,
	libmisc/limits.c: Return EXIT_FAILURE instead of 1, and
	EXIT_SUCCESS instead of 0.
	* libmisc/audit_help.c: Replace an fprintf() by fputs().
	* libmisc/audit_help.c: Remove documentation of the audit_logger
	returned values. The function returns void.
	* libmisc/system.c: Only return status if waitpid succeeded.
	Return -1 otherwise.

libmisc/sulog.c

@@ -83,7 +83,7 @@ void sulog (const char *tty, bool success, const char *oldname, const char *name
 		         "can't switch back to group `%d' in sulog",
 		         oldgid));
 		/* Do not return if the group permission were raised. */
-		exit (1);
+		exit (EXIT_FAILURE);
 	}
 	if (fp == (FILE *) 0) {
 		return;		/* can't open or create logfile */