[ALSA] ac97 - remove unused variable

AC97 Codec
remove a variable made obsolete by the last change

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index 1f09653..6983eea 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -2231,7 +2231,6 @@
  */
 void snd_ac97_resume(ac97_t *ac97)
 {
-	int i;
 	unsigned long end_time;
 
 	if (ac97->bus->ops->reset) {