[mutter] backends/crtc: Fix leak of MetaCrtcMode name string

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 66fe6d85d011933eaa6fb021f9d827685e8381ac
Author: Sebastian Keller <skeller gnome org>
Date:   Fri Jan 24 18:49:13 2020 +0100

    backends/crtc: Fix leak of MetaCrtcMode name string
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1020

 src/backends/meta-crtc.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/backends/meta-crtc.c b/src/backends/meta-crtc.c
index 7ca31ba39..85424c575 100644
--- a/src/backends/meta-crtc.c
+++ b/src/backends/meta-crtc.c
@@ -63,6 +63,8 @@ meta_crtc_mode_finalize (GObject *object)
   if (crtc_mode->driver_notify)
     crtc_mode->driver_notify (crtc_mode);
 
+  g_clear_pointer (&crtc_mode->name, g_free);
+
   G_OBJECT_CLASS (meta_crtc_mode_parent_class)->finalize (object);
 }