ALSA: hda: Fix unused variable warning

The previous code cleanup made a variable not really used, which now
leads to a compile warning.  Let's fix it.

Fixes: cac99f7 ("ALSA: hda: intel: Don't free interrupt when suspending")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

Author: tiwai

sound/pci/hda/hda_intel.c

@@ -1039,13 +1039,11 @@ static int azx_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
-	struct hdac_bus *bus;
 
 	if (!azx_is_pm_ready(card))
 		return 0;
 
 	chip = card->private_data;
-	bus = azx_bus(chip);
 	azx_shutdown_chip(chip);
 
 	trace_azx_suspend(chip);