ASoC: SOF: pcm: invoke platform hw_free for STOP/SUSPEND triggers

snd_sof_pcm_platform_hw_params() will be called when the stream is
restarted with a prepare ioctl. This happens in two cases i.e. when a
suspended stream is resumed or when a stream is restarted without
intermediate call to sof_pcm_hw_free(). Make sure to call
snd_sof_pcm_platform_hw_free() in both these cases to keep it balanced.
Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20211125101520.291581-5-kai.vehmanen@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/pcm.c

@@ -470,6 +470,10 @@ static int sof_pcm_trigger(struct snd_soc_component *component,
 		if (ret < 0)
 			return ret;
 
+		ret = snd_sof_pcm_platform_hw_free(sdev, substream);
+		if (ret < 0)
+			return ret;
+
 		/* free widget list only for SUSPEND trigger */
 		if (free_widget_list)
 			ret = sof_widget_list_free(sdev, spcm, substream->stream);