ASoC: jz4760: fix set but not used warning

make W=1 warning:

sound/soc/codecs/jz4760.c: In function ‘jz4760_codec_startup’:
sound/soc/codecs/jz4760.c:201:6: error: variable ‘ret’ set but not
used [-Werror=unused-but-set-variable]
  201 |  int ret;
      |      ^~~
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302205926.49063-3-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/jz4760.c

@@ -198,7 +198,7 @@ static int jz4760_codec_startup(struct snd_pcm_substream *substream,
 {
 	struct snd_soc_component *codec = dai->component;
 	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(codec);
-	int ret;
+	int ret = 0;
 
 	/*
 	 * SYSCLK output from the codec to the AIC is required to keep the
@@ -207,7 +207,7 @@ static int jz4760_codec_startup(struct snd_pcm_substream *substream,
 	 */
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		ret = snd_soc_dapm_force_enable_pin(dapm, "SYSCLK");
-	return 0;
+	return ret;
 }
 
 static void jz4760_codec_shutdown(struct snd_pcm_substream *substream,