ui/vdagent: reset outbuf on disconnect

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210805135715.857938-11-marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

ui/vdagent.c

@@ -723,6 +723,7 @@ static void vdagent_chr_accept_input(Chardev *chr)
 
 static void vdagent_disconnect(VDAgentChardev *vd)
 {
+    buffer_reset(&vd->outbuf);
     vdagent_reset_bufs(vd);
     vd->caps = 0;
     if (vd->mouse_hs) {