allocate a major number to midi, since midi is already enabled

ok deraadt, miod

src/etc/etc.sparc64/MAKEDEV.md

@@ -1,6 +1,6 @@
 define(MACHINE,sparc64)dnl
 vers(__file__,
-	{-$OpenBSD: MAKEDEV.md,v 1.61 2010/09/30 15:27:54 claudio Exp $-},
+	{-$OpenBSD: MAKEDEV.md,v 1.62 2010/10/08 18:21:34 ratchov Exp $-},
 etc.MACHINE)dnl
 dnl
 dnl Copyright (c) 2001-2006 Todd T. Fries <todd@OpenBSD.org>
@@ -113,6 +113,7 @@ _DEV(oppr)
 _DEV(pci, 52)
 _DEV(pf, 73)
 _DEV(pppx, 131)
+_DEV(rmidi, 68)
 _DEV(rnd, 119)
 _DEV(systrace, 50)
 _DEV(tun, 111)