ALSA: hda: fix some klockwork scan warnings

This patch fixes some warnings from klockwork.

These warnings are not the real issues. The patch
adds the sanity check.

Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index d0d5ad8beac5..56e5204ac9c1 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1680,6 +1680,11 @@ static bool check_non_pcm_per_cvt(struct hda_codec *codec, hda_nid_t cvt_nid)
 
         mutex_lock(&codec->spdif_mutex);
         spdif = snd_hda_spdif_out_of_nid(codec, cvt_nid);
+        /* Add sanity check to pass klockwork check.
+         * This should never happen.
+         */
+        if (WARN_ON(spdif == NULL))
+                return true;
         non_pcm = !!(spdif->status & IEC958_AES0_NONAUDIO);
         mutex_unlock(&codec->spdif_mutex);
         return non_pcm;