ASoC: soc-core: remove rtd NULL check on soc_free_pcm_runtime()

static soc_free_pcm_runtime() is never called with rtd == NULL.
This patch removes unnecessary rtd == NULL check from
soc_free_pcm_runtime().

Furthermore, NULL check before kfree() is not needed.
This patch removes such ckeck too.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -639,8 +639,7 @@ static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
 
 static void soc_free_pcm_runtime(struct snd_soc_pcm_runtime *rtd)
 {
-	if (rtd && rtd->codec_dais)
-		kfree(rtd->codec_dais);
+	kfree(rtd->codec_dais);
 	snd_soc_rtdcom_del_all(rtd);
 	kfree(rtd);
 }