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hjfs: use smaller fixed buffer size

again, avoiding arbitrary size stack allocation
when using bio with libthread

--- a/sys/src/cmd/hjfs/auth.c

+++ b/sys/src/cmd/hjfs/auth.c

@@ -200,6 +200,7 @@

 	User *u, *v;

 	int nu, i;

 	char ubuf[USERLEN], *uname;

+	uchar bbuf[RBLOCK];

 	Biobuf buf;

 	rlock(&fs->udatal);

@@ -210,7 +211,7 @@

 	}else

 		nu = fs->nudata;

-	Binit(&buf, 2, OWRITE);

+	Binits(&buf, 2, OWRITE, bbuf, sizeof(bbuf));

 	if(ch != nil)

 		Biofn(&buf, Bchanwrite);

 	buf.aux = ch;

-- 

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