sound: Remove unnecessary casts of private_data

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/isa/ad1816a/ad1816a.c b/sound/isa/ad1816a/ad1816a.c
index bbcbf92..3cb75bc 100644
--- a/sound/isa/ad1816a/ad1816a.c
+++ b/sound/isa/ad1816a/ad1816a.c
@@ -162,7 +162,7 @@
 				sizeof(struct snd_card_ad1816a), &card);
 	if (error < 0)
 		return error;
-	acard = (struct snd_card_ad1816a *)card->private_data;
+	acard = card->private_data;
 
 	if ((error = snd_card_ad1816a_pnp(dev, acard, pcard, pid))) {
 		snd_card_free(card);
diff --git a/sound/isa/azt2320.c b/sound/isa/azt2320.c
index f7aa637..aac8dc1 100644
--- a/sound/isa/azt2320.c
+++ b/sound/isa/azt2320.c
@@ -188,7 +188,7 @@
 				sizeof(struct snd_card_azt2320), &card);
 	if (error < 0)
 		return error;
-	acard = (struct snd_card_azt2320 *)card->private_data;
+	acard = card->private_data;
 
 	if ((error = snd_card_azt2320_pnp(dev, acard, pcard, pid))) {
 		snd_card_free(card);
diff --git a/sound/isa/gus/gusmax.c b/sound/isa/gus/gusmax.c
index f26eac8..3e4a58b 100644
--- a/sound/isa/gus/gusmax.c
+++ b/sound/isa/gus/gusmax.c
@@ -191,7 +191,7 @@
 
 static void snd_gusmax_free(struct snd_card *card)
 {
-	struct snd_gusmax *maxcard = (struct snd_gusmax *)card->private_data;
+	struct snd_gusmax *maxcard = card->private_data;
 	
 	if (maxcard == NULL)
 		return;
@@ -219,7 +219,7 @@
 	if (err < 0)
 		return err;
 	card->private_free = snd_gusmax_free;
-	maxcard = (struct snd_gusmax *)card->private_data;
+	maxcard = card->private_data;
 	maxcard->card = card;
 	maxcard->irq = -1;
 	
diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c
index 81284a8..2259e3f 100644
--- a/sound/isa/sb/sb8.c
+++ b/sound/isa/sb/sb8.c
@@ -72,7 +72,7 @@
 
 static void snd_sb8_free(struct snd_card *card)
 {
-	struct snd_sb8 *acard = (struct snd_sb8 *)card->private_data;
+	struct snd_sb8 *acard = card->private_data;
 
 	if (acard == NULL)
 		return;