ASoC: fsi: care fsi_hw_start/stop() return value

Current FSI driver didn't care fsi_hw_start/stop() return value,
and it causes WARNING() call if SNDRV_PCM_TRIGGER_START failed.
This patch solved this issue

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/sh/fsi.c

@@ -1335,17 +1335,19 @@ static int fsi_hw_startup(struct fsi_priv *fsi,
 
 	/* start master clock */
 	if (fsi_is_clk_master(fsi))
-		fsi_set_master_clk(dev, fsi, fsi->rate, 1);
+		return fsi_set_master_clk(dev, fsi, fsi->rate, 1);
 
 	return 0;
 }
 
-static void fsi_hw_shutdown(struct fsi_priv *fsi,
+static int fsi_hw_shutdown(struct fsi_priv *fsi,
 			    struct device *dev)
 {
 	/* stop master clock */
 	if (fsi_is_clk_master(fsi))
-		fsi_set_master_clk(dev, fsi, fsi->rate, 0);
+		return fsi_set_master_clk(dev, fsi, fsi->rate, 0);
+
+	return 0;
 }
 
 static int fsi_dai_startup(struct snd_pcm_substream *substream,
@@ -1376,13 +1378,16 @@ static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		fsi_stream_init(fsi, io, substream);
-		fsi_hw_startup(fsi, io, dai->dev);
-		ret = fsi_stream_transfer(io);
-		if (0 == ret)
+		if (!ret)
+			ret = fsi_hw_startup(fsi, io, dai->dev);
+		if (!ret)
+			ret = fsi_stream_transfer(io);
+		if (!ret)
 			fsi_stream_start(fsi, io);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
-		fsi_hw_shutdown(fsi, dai->dev);
+		if (!ret)
+			ret = fsi_hw_shutdown(fsi, dai->dev);
 		fsi_stream_stop(fsi, io);
 		fsi_stream_quit(fsi, io);
 		break;