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upas/fs: don't try to fstat a renamed fd

cwfs apparently can get unhappy about it.

--- a/sys/src/cmd/upas/fs/idx.c

+++ b/sys/src/cmd/upas/fs/idx.c

@@ -271,7 +271,8 @@

 	if(dirfwstat(fd, &n) == -1)

 		sysfatal("dirfwstat: %r");

-	d = dirfstat(fd);

+	snprint(buf, sizeof buf, "%s.idx", mb->path);

+	d = dirstat(buf);

 	if(d == nil)

 		sysfatal("dirfstat: %r");

 	mb->qid = d->qid;