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We already have snd_pcm_direction_name(). Let's use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/87ttg7k52k.wl-kuninori.morimoto.gx@renesas.com

Signed-off-by: Takashi Iwai <tiwai@suse.de>