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cfs: fix bad memory deref in rstat (from yk's patch/cfs-rstatctlbug)

--- a/sys/src/cmd/cfs/cfs.c

+++ b/sys/src/cmd/cfs/cfs.c

@@ -646,6 +646,7 @@

 void

 rstat(Mfile *mf)

 {

+	uchar buf[STATMAX];

 	Dir d;

 	if(statson && ctltest(mf)){

@@ -659,8 +660,8 @@

 		d.muid = "none";

 		d.atime = time(nil);

 		d.mtime = d.atime;

-		c.rhdr.nstat = convD2M(&d, c.rhdr.stat,

-			sizeof c.rhdr - (c.rhdr.stat - (uchar*)&c.rhdr));

+		c.rhdr.nstat = convD2M(&d, buf, sizeof buf);

+		c.rhdr.stat = buf;

 		sendreply(0);

 		return;

 	}

-- 

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