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devkbd: fix missing devdrirread

--- a/sys/src/9/pc/devkbd.c

+++ b/sys/src/9/pc/devkbd.c

@@ -355,21 +355,24 @@

 }

 static Block*

-kbdbread(Chan *c, long n, ulong)

+kbdbread(Chan *c, long n, ulong off)

 {

-	if(c->qid.path != Qscancode)

-		error(Egreg);

-

-	return qbread(kbd.q, n);

+	if(c->qid.path == Qscancode)

+		return qbread(kbd.q, n);

+	else

+		return devbread(c, n, off);

 }

 static long

 kbdread(Chan *c, void *a, long n, vlong)

 {

-	if(c->qid.path != Qscancode)

-		error(Egreg);

+	if(c->qid.path == Qscancode)

+		return qread(kbd.q, a, n);

+	if(c->qid.path == Qdir)

+		return devdirread(c, a, n, kbdtab, nelem(kbdtab), devgen);

-	return qread(kbd.q, a, n);

+	error(Egreg);

+	return 0;

 }

 static long

-- 

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