[ALSA] Optimize for config without PROC_FS (pci drivers)

Optimize the code when compiled without CONFIG_PROC_FS for some pci drivers.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ac97/ak4531_codec.c b/sound/pci/ac97/ak4531_codec.c
index 3eb8855..dcfb503 100644
--- a/sound/pci/ac97/ak4531_codec.c
+++ b/sound/pci/ac97/ak4531_codec.c
@@ -30,7 +30,11 @@
 MODULE_DESCRIPTION("Universal routines for AK4531 codec");
 MODULE_LICENSE("GPL");
 
+#ifdef CONFIG_PROC_FS
 static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531);
+#else
+#define snd_ak4531_proc_init(card,ak)
+#endif
 
 /*
  *
@@ -425,8 +429,9 @@
 }
 #endif
 
+#ifdef CONFIG_PROC_FS
 /*
-
+ * /proc interface
  */
 
 static void snd_ak4531_proc_read(struct snd_info_entry *entry, 
@@ -448,6 +453,7 @@
 	if (! snd_card_proc_new(card, "ak4531", &entry))
 		snd_info_set_text_ops(entry, ak4531, 1024, snd_ak4531_proc_read);
 }
+#endif
 
 EXPORT_SYMBOL(snd_ak4531_mixer);
 #ifdef CONFIG_PM