ALSA: hda - Fix "unused variable" compile warning

  sound/pci/hda/patch_realtek.c: In function ‘alc_apply_fixup’:
  sound/pci/hda/patch_realtek.c:1724:14: warning: unused variable ‘modelname’

snd_printdd() is evaluated only when CONFIG_SND_DEBUG_VERBOSE=y.

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