ALSA: hda - Return the created kcontrol in __snd_hda_add_vmaster()

It'll be used for adding hooks in later patches.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_analog.c b/sound/pci/hda/patch_analog.c
index fa97a0c..7143393 100644
--- a/sound/pci/hda/patch_analog.c
+++ b/sound/pci/hda/patch_analog.c
@@ -229,7 +229,7 @@
 					  (spec->slave_vols ?
 					   spec->slave_vols : ad_slave_pfxs),
 					  "Playback Volume",
-					  !spec->avoid_init_slave_vol);
+					  !spec->avoid_init_slave_vol, NULL);
 		if (err < 0)
 			return err;
 	}