ALSA: dummy: Allocate resources with device-managed APIs

Use the new snd_devm_card_new() for the card object allocation, and
clean up the superfluous remove callback.

Link: https://lore.kernel.org/r/20210715075941.23332-79-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: tiwai

sound/drivers/dummy.c

@@ -1025,8 +1025,8 @@ static int snd_dummy_probe(struct platform_device *devptr)
 	int idx, err;
 	int dev = devptr->id;
 
-	err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
-			   sizeof(struct snd_dummy), &card);
+	err = snd_devm_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
+				sizeof(struct snd_dummy), &card);
 	if (err < 0)
 		return err;
 	dummy = card->private_data;
@@ -1047,7 +1047,7 @@ static int snd_dummy_probe(struct platform_device *devptr)
 			pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
 		err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
 		if (err < 0)
-			goto __nodev;
+			return err;
 	}
 
 	dummy->pcm_hw = dummy_pcm_hardware;
@@ -1078,26 +1078,17 @@ static int snd_dummy_probe(struct platform_device *devptr)
 
 	err = snd_card_dummy_new_mixer(dummy);
 	if (err < 0)
-		goto __nodev;
+		return err;
 	strcpy(card->driver, "Dummy");
 	strcpy(card->shortname, "Dummy");
 	sprintf(card->longname, "Dummy %i", dev + 1);
 
 	dummy_proc_init(dummy);
 
 	err = snd_card_register(card);
-	if (err == 0) {
-		platform_set_drvdata(devptr, card);
-		return 0;
-	}
-      __nodev:
-	snd_card_free(card);
-	return err;
-}
-
-static int snd_dummy_remove(struct platform_device *devptr)
-{
-	snd_card_free(platform_get_drvdata(devptr));
+	if (err < 0)
+		return err;
+	platform_set_drvdata(devptr, card);
 	return 0;
 }
 
@@ -1128,7 +1119,6 @@ static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
 
 static struct platform_driver snd_dummy_driver = {
 	.probe		= snd_dummy_probe,
-	.remove		= snd_dummy_remove,
 	.driver		= {
 		.name	= SND_DUMMY_DRIVER,
 		.pm	= SND_DUMMY_PM_OPS,