[ALSA] Cleanup unused argument for snd_power_wait()

Removed the unused file argument of snd_power_wait().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/core.h b/include/sound/core.h
index 7f32c12..d1d043f 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -170,7 +170,7 @@
 }
 
 /* init.c */
-int snd_power_wait(struct snd_card *card, unsigned int power_state, struct file *file);
+int snd_power_wait(struct snd_card *card, unsigned int power_state);
 
 #else /* ! CONFIG_PM */