* 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.

src/logoutd.c

@@ -175,11 +175,11 @@ int main (int argc, char **argv)
 	pid = fork ();
 	if (pid > 0) {
 		/* parent */
-		exit (0);
+		exit (EXIT_SUCCESS);
 	} else if (pid < 0) {
 		/* error */
 		perror ("fork");
-		exit (1);
+		exit (EXIT_FAILURE);
 	}
 #endif				/* !DEBUG */
 
@@ -276,7 +276,7 @@ int main (int argc, char **argv)
 			/*
 			 * This child has done all it can, drop dead.
 			 */
-			exit (0);
+			exit (EXIT_SUCCESS);
 		}
 
 #ifdef USE_UTMPX
@@ -293,7 +293,7 @@ int main (int argc, char **argv)
 		 */
 		while (wait (&status) != -1);
 	}
-	return 1;
-	/* NOT REACHED */
+
+	return EXIT_FAILURE;
 }