ALSA: hda - Get rid of magic digits for subdev hack

Define a proper const for a magic 31bit flag for subdev / NID setup
with a brief comment.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index d71e651046eb..5e21b35207ab 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -1523,7 +1523,7 @@ int snd_hda_ctl_add(struct hda_codec *codec, hda_nid_t nid,
         int err;
         struct hda_nid_item *item;
 
-        if (kctl->id.subdevice & (1<<31)) {
+        if (kctl->id.subdevice & HDA_SUBDEV_NID_FLAG) {
                 if (nid == 0)
                         nid = kctl->id.subdevice & 0xffff;
                 kctl->id.subdevice = 0;