void functions don't return 0

From Klemens Nanni

src/lib/libc/string/strmode.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: strmode.3,v 1.16 2013/06/05 03:39:23 tedu Exp $
+.\" $OpenBSD: strmode.3,v 1.17 2017/07/05 11:44:35 tb Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)strmode.3	8.3 (Berkeley) 7/28/94
 .\"
-.Dd $Mdocdate: June 5 2013 $
+.Dd $Mdocdate: July 5 2017 $
 .Dt STRMODE 3
 .Os
 .Sh NAME
@@ -140,10 +140,6 @@ The last character is a plus sign
 if there are any alternate
 or additional access control methods associated with the inode, otherwise
 it will be a space.
-.Sh RETURN VALUES
-The
-.Fn strmode
-function always returns 0.
 .Sh SEE ALSO
 .Xr chmod 1 ,
 .Xr find 1 ,