virtio-input: ignore events until the guest driver is ready

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit d9460a7557)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

hw/input/virtio-input.c

@@ -20,6 +20,10 @@ void virtio_input_send(VirtIOInput *vinput, virtio_input_event *event)
     unsigned have, need;
     int i, len;
 
+    if (!vinput->active) {
+        return;
+    }
+
     /* queue up events ... */
     if (vinput->qindex == vinput->qsize) {
         vinput->qsize++;