Add a Dirtab entry for ".", which some of the
devgen routines blindly assume is always present
as entry 0.  Without this nothing at all, not even
".", appears when I list the directory.  After
adding it I can read the temperature off my ASUS
P2B motherboard.

Reference: /n/sources/patch/applied/lm78-dir
Date: Sat Oct  1 08:41:45 CES 2005

--- /sys/src/9/pc/devlm78.c	Sat Oct  1 08:38:49 2005
+++ /sys/src/9/pc/devlm78.c	Sat Oct  1 08:38:48 2005
@@ -57,6 +57,7 @@
 };
 
 static Dirtab lm78dir[] = {
+	".",			{ Qdir, 0, QTDIR},	0,	0555,
 	"lm78vram",	{ Qlm78vram, 0 },	0,	0444,
 };