[mutter] backends/native: Fix input device touch hash table leak

[Jonas Ådahl <jadahl src gnome org>]

commit 94fb82137fd8aef1e18090744e6416beec683831
Author: Sebastian Keller <skeller gnome org>
Date:   Mon Jun 8 10:00:57 2020 +0200

    backends/native: Fix input device touch hash table leak
    
    It was emptied but never unref'ed in finalize.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1304

 src/backends/native/meta-input-device-native.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/backends/native/meta-input-device-native.c b/src/backends/native/meta-input-device-native.c
index 4b87eb2a08..3ba9548065 100644
--- a/src/backends/native/meta-input-device-native.c
+++ b/src/backends/native/meta-input-device-native.c
@@ -69,6 +69,7 @@ meta_input_device_native_finalize (GObject *object)
 
   meta_input_device_native_release_touch_slots (device_evdev,
                                                 g_get_monotonic_time ());
+  g_clear_pointer (&device_evdev->touches, g_hash_table_unref);
 
   backend = clutter_get_default_backend ();
   seat = clutter_backend_get_default_seat (backend);