ALSA: pci: Clean up with new procfs helpers

Simplify the proc fs creation code with new helper functions,
snd_card_ro_proc_new() and snd_card_rw_proc_new().
Just a code refactoring and no functional changes.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ak4531_codec.c b/sound/pci/ak4531_codec.c
index 2fb1fbb..11e902c 100644
--- a/sound/pci/ak4531_codec.c
+++ b/sound/pci/ak4531_codec.c
@@ -481,8 +481,5 @@ static void snd_ak4531_proc_read(struct snd_info_entry *entry,
 static void
 snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531)
 {
-	struct snd_info_entry *entry;
-
-	if (! snd_card_proc_new(card, "ak4531", &entry))
-		snd_info_set_text_ops(entry, ak4531, snd_ak4531_proc_read);
+	snd_card_ro_proc_new(card, "ak4531", ak4531, snd_ak4531_proc_read);
 }