ALSA: hda - Add snd_hda_gen_free() and snd_hda_gen_check_power_status()

Just to remove duplicated codes.
Also fixed EXPORT_SYMBOL() in hda_generic.c.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_generic.h b/sound/pci/hda/hda_generic.h
index 7e84c22..00a1eab 100644
--- a/sound/pci/hda/hda_generic.h
+++ b/sound/pci/hda/hda_generic.h
@@ -218,6 +218,7 @@
 void snd_hda_gen_spec_free(struct hda_gen_spec *spec);
 
 int snd_hda_gen_init(struct hda_codec *codec);
+void snd_hda_gen_free(struct hda_codec *codec);
 
 struct nid_path *snd_hda_get_nid_path(struct hda_codec *codec,
 				      hda_nid_t from_nid, hda_nid_t to_nid);
@@ -257,4 +258,8 @@
 				struct hda_jack_tbl *jack);
 void snd_hda_gen_update_outputs(struct hda_codec *codec);
 
+#ifdef CONFIG_PM
+int snd_hda_gen_check_power_status(struct hda_codec *codec, hda_nid_t nid);
+#endif
+
 #endif /* __SOUND_HDA_GENERIC_H */