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/i2c/other/ak4xxx-adda.c b/sound/i2c/other/ak4xxx-adda.c
index 1adb8a3..ebab6c7 100644
--- a/sound/i2c/other/ak4xxx-adda.c
+++ b/sound/i2c/other/ak4xxx-adda.c
@@ -878,7 +878,7 @@
 static void proc_regs_read(struct snd_info_entry *entry,
 		struct snd_info_buffer *buffer)
 {
-	struct snd_akm4xxx *ak = (struct snd_akm4xxx *)entry->private_data;
+	struct snd_akm4xxx *ak = entry->private_data;
 	int reg, val, chip;
 	for (chip = 0; chip < ak->num_chips; chip++) {
 		for (reg = 0; reg < ak->total_regs; reg++) {