The frame callback set up via wl_surface_frame() needs to be freed with
wl_callback_destroy() or we'll leak memory.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97065
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
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