[PATCH 2/5] ALSA: pcmtest: Fix leak at probe error

[Takashi Iwai <tiwai@suse.de>]

When an error happens at probe of pcmtest driver before
snd_card_register() succeeds, we have to release the card explicitly,
but it's not done, leading to a potential memory leak.

Use the new auto-clean mechanism to handle the error case at probe.

Fixes: 315a3d57c64c ("ALSA: Implement the new Virtual PCM Test Driver")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/drivers/pcmtest.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/drivers/pcmtest.c b/sound/drivers/pcmtest.c
index fea9580593e6..4733f7c7729f 100644
--- a/sound/drivers/pcmtest.c
+++ b/sound/drivers/pcmtest.c
@@ -596,7 +596,7 @@ static int snd_pcmtst_create(struct snd_card *card, struct platform_device *pdev
 
 static int pcmtst_probe(struct platform_device *pdev)
 {
-	struct snd_card *card;
+	struct snd_card *card __free(snd_card_free) = NULL;
 	struct pcmtst *pcmtst;
 	int err;
 
@@ -620,6 +620,7 @@ static int pcmtst_probe(struct platform_device *pdev)
 		return err;
 
 	platform_set_drvdata(pdev, pcmtst);
+	card = NULL; /* probe succeeded, don't release as error */
 
 	return 0;
 }
-- 
2.55.0