[mutter] kms: Fix drm_connector mem-leak in meta_kms_connector_update_state

[Jonas Ådahl <jadahl src gnome org>]

commit 0eb355e29d0a0644dcf30732f07c56b83ac9fd1c
Author: Hans de Goede <hdegoede redhat com>
Date:   Fri Aug 2 22:56:38 2019 +0200

    kms: Fix drm_connector mem-leak in meta_kms_connector_update_state
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/713

 src/backends/native/meta-kms-connector.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/backends/native/meta-kms-connector.c b/src/backends/native/meta-kms-connector.c
index 226dd5e71..8eed11229 100644
--- a/src/backends/native/meta-kms-connector.c
+++ b/src/backends/native/meta-kms-connector.c
@@ -490,6 +490,8 @@ meta_kms_connector_update_state (MetaKmsConnector *connector,
   meta_kms_connector_read_state (connector, impl_device,
                                  drm_connector,
                                  drm_resources);
+  if (drm_connector)
+    drmModeFreeConnector (drm_connector);
 }
 
 static void