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: cac99f73 ("ALSA: hda: intel: Don't free interrupt when suspending")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202411050247.3esQz7Am-lkp@intel.com/
Link: https://patch.msgid.link/20241104190654.32216-1-tiwai@suse.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>