ASoC: amd: fix memory leak in acp3x pdm dma ops

Fixes: 4a767b1d039a8 ("ASoC: amd: add acp3x pdm driver dma ops")
Signed-off-by: Chris Bainbridge <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/amd/renoir/acp3x-pdm-dma.c

···
 			     struct snd_pcm_substream *substream)
 {
 	struct pdm_dev_data *adata = dev_get_drvdata(component->dev);
+	struct pdm_stream_instance *rtd = substream->runtime->private_data;
 
 	disable_pdm_interrupts(adata->acp_base);
 	adata->capture_stream = NULL;
+	kfree(rtd);
 	return 0;
 }