ASoC: qcom: common: Fix refcount imbalance on error

for_each_child_of_node returns a node pointer np with
refcount incremented. So when devm_kzalloc fails, a
pairing refcount decrement is needed to keep np's
refcount balanced.

Fixes: 16395cee ("ASoC: qcom: common: Fix NULL pointer in of parser")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/r/20200820042828.10308-1-dinghao.liu@zju.edu.cnSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/qcom/common.c

@@ -52,8 +52,10 @@ int qcom_snd_parse_of(struct snd_soc_card *card)
 
 	for_each_child_of_node(dev->of_node, np) {
 		dlc = devm_kzalloc(dev, 2 * sizeof(*dlc), GFP_KERNEL);
-		if (!dlc)
-			return -ENOMEM;
+		if (!dlc) {
+			ret = -ENOMEM;
+			goto err;
+		}
 
 		link->cpus	= &dlc[0];
 		link->platforms	= &dlc[1];