ALSA: hda - Fix unused variable warning

The unused variable was forgotten to be removed and now we get a
compiler warning:
  sound/pci/hda/hda_codec.c: In function 'hda_codec_runtime_suspend':
  sound/pci/hda/hda_codec.c:2926:18: warning: unused variable 'pcm'

Fixes: 17bc4815 ("ALSA: pci: Remove superfluous snd_pcm_suspend*() calls")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.c

@@ -2923,7 +2923,6 @@ static void hda_call_codec_resume(struct hda_codec *codec)
 static int hda_codec_runtime_suspend(struct device *dev)
 {
 	struct hda_codec *codec = dev_to_hda_codec(dev);
-	struct hda_pcm *pcm;
 	unsigned int state;
 
 	cancel_delayed_work_sync(&codec->jackpoll_work);