[ALSA] oxygen: use an array of snd_kcontrol pointers

Use an array for the pointers to known controls so that it is easier to
add more.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/oxygen/oxygen_pcm.c b/sound/pci/oxygen/oxygen_pcm.c
index d4a1d73..5f67a79 100644
--- a/sound/pci/oxygen/oxygen_pcm.c
+++ b/sound/pci/oxygen/oxygen_pcm.c
@@ -209,11 +209,11 @@
 	chip->pcm_active |= 1 << channel;
 	if (channel == PCM_SPDIF) {
 		chip->spdif_pcm_bits = chip->spdif_bits;
-		chip->spdif_pcm_ctl->vd[0].access &=
+		chip->controls[CONTROL_SPDIF_PCM]->vd[0].access &=
 			~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
 			       SNDRV_CTL_EVENT_MASK_INFO,
-			       &chip->spdif_pcm_ctl->id);
+			       &chip->controls[CONTROL_SPDIF_PCM]->id);
 	}
 	mutex_unlock(&chip->mutex);
 
@@ -258,11 +258,11 @@
 	mutex_lock(&chip->mutex);
 	chip->pcm_active &= ~(1 << channel);
 	if (channel == PCM_SPDIF) {
-		chip->spdif_pcm_ctl->vd[0].access |=
+		chip->controls[CONTROL_SPDIF_PCM]->vd[0].access |=
 			SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
 			       SNDRV_CTL_EVENT_MASK_INFO,
-			       &chip->spdif_pcm_ctl->id);
+			       &chip->controls[CONTROL_SPDIF_PCM]->id);
 	}
 	if (channel == PCM_SPDIF || channel == PCM_MULTICH)
 		oxygen_update_spdif_source(chip);