ASoC: au1x: dbdma2: plug memleak in pcm device creation error path

free the allocated pcm platform device in the error path.
Signed-off-by: NManuel Lauss <manuel.lauss@gmail.com>
Acked-by: NLiam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/au1x/dbdma2.c

@@ -480,6 +480,7 @@ struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev)
 	if (!ret)
 		return pd;
 
+	platform_device_put(pd);
 out:
 	kfree(res);
 	return NULL;