ASoC: rsnd: makes rsnd_ssi_is_dma_mode() static

ssi.c only is using rsnd_ssi_is_dma_mode().
Let's move it as static function.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/rsnd.h

@@ -726,7 +726,6 @@ extern const char * const volume_ramp_rate[];
 int rsnd_ssi_probe(struct rsnd_priv *priv);
 void rsnd_ssi_remove(struct rsnd_priv *priv);
 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id);
-int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io);
 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io);
 

sound/soc/sh/rcar/ssi.c

@@ -117,6 +117,8 @@ struct rsnd_ssi {
 	(rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
 #define rsnd_ssi_can_output_clk(mod) (!__rsnd_ssi_is_pin_sharing(mod))
 
+static int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
+
 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 {
 	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
@@ -1003,12 +1005,11 @@ static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
 	.get_status	= rsnd_ssi_get_status,
 };
 
-int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
+static int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
 {
 	return mod->ops == &rsnd_ssi_dma_ops;
 }
 
-
 /*
  *		ssi mod function
  */