usb-hub: add tracepoint for status reports

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/hw/usb/dev-hub.c b/hw/usb/dev-hub.c
index e865a98..54f63c0 100644
--- a/hw/usb/dev-hub.c
+++ b/hw/usb/dev-hub.c
@@ -475,6 +475,7 @@
                 port->wPortChange_reported = port->wPortChange;
             }
             if (status != 0) {
+                trace_usb_hub_status_report(s->dev.addr, status);
                 for(i = 0; i < n; i++) {
                     buf[i] = status >> (8 * i);
                 }