ASoC: fix memory leak

If dai_link is already bound then we just returned and leaked rtd and
rtd->codec_dais which were allocated by soc_new_pcm_runtime(). We do not
need this newly allocated rtd to check if dai_link is already binded. Lets
check first if it is already binded before allocating this memory.
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -986,16 +986,16 @@ static int soc_bind_dai_link(struct snd_soc_card *card,
 
 	dev_dbg(card->dev, "ASoC: binding %s\n", dai_link->name);
 
-	rtd = soc_new_pcm_runtime(card, dai_link);
-	if (!rtd)
-		return -ENOMEM;
-
 	if (soc_is_dai_link_bound(card, dai_link)) {
 		dev_dbg(card->dev, "ASoC: dai link %s already bound\n",
 			dai_link->name);
 		return 0;
 	}
 
+	rtd = soc_new_pcm_runtime(card, dai_link);
+	if (!rtd)
+		return -ENOMEM;
+
 	cpu_dai_component.name = dai_link->cpu_name;
 	cpu_dai_component.of_node = dai_link->cpu_of_node;
 	cpu_dai_component.dai_name = dai_link->cpu_dai_name;