auth/factotum: fix flush (thanks Erik Quanstrom)

R=rsc
http://codereview.appspot.com/6402044
diff --git a/src/cmd/auth/factotum/fs.c b/src/cmd/auth/factotum/fs.c
index 2edbc7b..fd89b2c 100644
--- a/src/cmd/auth/factotum/fs.c
+++ b/src/cmd/auth/factotum/fs.c
@@ -419,8 +419,9 @@
 static void
 fsflush(Req *r)
 {
-	confirmflush(r);
-	logflush(r);
+	confirmflush(r->oldreq);
+	logflush(r->oldreq);
+	respond(r, nil);
 }
 
 static void