xwayland: Fix invalid pointer access in drm_lease_device_handle_released.

drm_lease_device_handle_released uses the wrong pointer type in the
callback. This will cause crash when compositor removes drm lease device
object.

Fixes: 089e7f98 - Xwayland: implement drm-lease-v1

Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
Signed-off-by: Weng Xuetian <wengxt@gmail.com>
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