ASoC: rsnd: core.c: add WARN_ON() on rsnd_channel_normalization()

chan > 8 or chan < 0 shouldn't happen.
This patch uses WARN_ON() for such case.
Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87y2x530a4.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -302,7 +302,7 @@ int rsnd_runtime_channel_after_ctu_with_params(struct rsnd_dai_stream *io,
 
 int rsnd_channel_normalization(int chan)
 {
-	if ((chan > 8) || (chan < 0))
+	if (WARN_ON((chan > 8) || (chan < 0)))
 		return 0;
 
 	/* TDM Extend Mode needs 8ch */