uv_truncate: call uvMaybeFireCloseCb when closing in barrier cb.

This is for consistency with uvSnapshotPutBarrierCb where this is also
done.

Signed-off-by: Mathieu Borderé <mathieu.bordere@canonical.com>

src/uv_truncate.c

@@ -132,6 +132,7 @@ static void uvTruncateBarrierCb(struct UvBarrierReq *barrier)
     if (uv->closing) {
         tracef("closing => don't truncate");
         RaftHeapFree(truncate);
+        uvMaybeFireCloseCb(uv);
         return;
     }