mesa/st: release debug_output after destroying the context Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3230 Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2218 Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5789>