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/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index d2ddb959c290..7f76a97954f9 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -2689,7 +2689,7 @@ stac_control_new(struct sigmatel_spec *spec,
                 return NULL;
         }
         if (nid)
-                knew->subdevice = (1<<31)|nid;
+                knew->subdevice = HDA_SUBDEV_NID_FLAG | nid;
         return knew;
 }