ASoC: mediatek: common: Fix refcount leak in parse_dai_link_info

Add missing of_node_put()s before the returns to balance
of_node_get()s and of_node_put()s, which may get unbalanced
in case the for loop 'for_each_available_child_of_node' returns
early.

Fixes: 4302187d ("ASoC: mediatek: common: add soundcard driver common code")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@inria.fr>
Link: https://lore.kernel.org/r/202304090504.2K8L6soj-lkp@intel.com/Signed-off-by: Aashish Sharma <shraash@google.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Reviewed-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20230411003431.4048700-1-shraash@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/common/mtk-soundcard-driver.c

@@ -47,20 +47,26 @@ int parse_dai_link_info(struct snd_soc_card *card)
 	/* Loop over all the dai link sub nodes */
 	for_each_available_child_of_node(dev->of_node, sub_node) {
 		if (of_property_read_string(sub_node, "link-name",
-					    &dai_link_name))
+					    &dai_link_name)) {
+			of_node_put(sub_node);
 			return -EINVAL;
+		}
 
 		for_each_card_prelinks(card, i, dai_link) {
 			if (!strcmp(dai_link_name, dai_link->name))
 				break;
 		}
 
-		if (i >= card->num_links)
+		if (i >= card->num_links) {
+			of_node_put(sub_node);
 			return -EINVAL;
+		}
 
 		ret = set_card_codec_info(card, sub_node, dai_link);
-		if (ret < 0)
+		if (ret < 0) {
+			of_node_put(sub_node);
 			return ret;
+		}
 	}
 
 	return 0;