[PATCH v2 1/6] ASoC: samsung: tm2_wm5510: fix check of of_parse return value

[Pierre-Louis Bossart]

cppcheck warning:

sound/soc/samsung/tm2_wm5110.c:605:6: style: Variable 'ret' is
reassigned a value before the old one has been
used. [redundantAssignment]
 ret = devm_snd_soc_register_component(dev, &tm2_component,
     ^
sound/soc/samsung/tm2_wm5110.c:554:7: note: ret is assigned
  ret = of_parse_phandle_with_args(dev->of_node, "i2s-controller",
      ^
sound/soc/samsung/tm2_wm5110.c:605:6: note: ret is overwritten
 ret = devm_snd_soc_register_component(dev, &tm2_component,
     ^

The args is a stack variable, so it could have junk (uninitialized)
therefore args.np could have a non-NULL and random value even though
property was missing. Later could trigger invalid pointer dereference.

This patch provides the correct fix, there's no need to check for
args.np because args.np won't be initialized on errors.

Fixes: 75fa6833aef3 ("ASoC: samsung: tm2_wm5110: check of_parse return value")
Fixes: 8d1513cef51a ("ASoC: samsung: Add support for HDMI audio on TM2board")
Cc: <stable at vger.kernel.org>
Suggested-by: Krzysztof Kozlowski <krzk at kernel.org>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/samsung/tm2_wm5110.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/samsung/tm2_wm5110.c b/sound/soc/samsung/tm2_wm5110.c
index da6204248f82..125e07f65d2b 100644
--- a/sound/soc/samsung/tm2_wm5110.c
+++ b/sound/soc/samsung/tm2_wm5110.c
@@ -553,7 +553,7 @@ static int tm2_probe(struct platform_device *pdev)
 
 		ret = of_parse_phandle_with_args(dev->of_node, "i2s-controller",
 						 cells_name, i, &args);
-		if (ret || !args.np) {
+		if (ret) {
 			dev_err(dev, "i2s-controller property parse error: %d\n", i);
 			ret = -EINVAL;
 			goto dai_node_put;
-- 
2.25.1