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Now we can use asoc_substream_to_rtd() macro,
let's use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87365n0ysi.wl-kuninori.morimoto.gx@renesas.com

Signed-off-by: Mark Brown <broonie@kernel.org>