input: add input_mouse_mode tracepoint

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/ui/input.c b/ui/input.c
index b8fc681..afc037c 100644
--- a/ui/input.c
+++ b/ui/input.c
@@ -289,6 +289,7 @@
     is_absolute = qemu_input_is_absolute();
 
     if (is_absolute != current_is_absolute) {
+        trace_input_mouse_mode(is_absolute);
         notifier_list_notify(&mouse_mode_notifiers, NULL);
     }