fix audio device creation.

--
Reported by & fix tested by: Denis A. Doroshenko <d.doroshenko@omnitel.net>

src/etc/etc.i386/MAKEDEV

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: MAKEDEV,v 1.94 2001/05/30 02:11:17 deraadt Exp $
+#	$OpenBSD: MAKEDEV,v 1.95 2001/06/04 15:29:00 brad Exp $
 #	$NetBSD: MAKEDEV,v 1.40 1996/03/31 00:50:47 perry Exp $
 #
 # Copyright (c) 1990 The Regents of the University of California.
@@ -577,10 +577,10 @@ lkm)
 
 audio*)
 	major=42
-	audio=audio$n
-	sound=sound$n
-	mixer=mixer$n
-	audioctl=audioctl$n
+	audio=audio$unit
+	sound=sound$unit
+	mixer=mixer$unit
+	audioctl=audioctl$unit
 	rm -f $sound $audio $mixer $audioctl
 	mknod $sound    c $major $unit
 	mknod $audio    c $major $(( $unit + 128 ))