ALSA: oxygen: add self-documenting functions

Introduce some trivial functions to better document the relationships of
the various model callbacks.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/pci/oxygen/hifier.c b/sound/pci/oxygen/hifier.c
index 0889399..1ab833f 100644
--- a/sound/pci/oxygen/hifier.c
+++ b/sound/pci/oxygen/hifier.c
@@ -94,6 +94,11 @@
 {
 }
 
+static void hifier_resume(struct oxygen *chip)
+{
+	hifier_registers_init(chip);
+}
+
 static void set_ak4396_params(struct oxygen *chip,
 			       struct snd_pcm_hw_params *params)
 {
@@ -150,7 +155,7 @@
 	.init = hifier_init,
 	.control_filter = hifier_control_filter,
 	.cleanup = hifier_cleanup,
-	.resume = hifier_registers_init,
+	.resume = hifier_resume,
 	.set_dac_params = set_ak4396_params,
 	.set_adc_params = set_cs5340_params,
 	.update_dac_volume = update_ak4396_volume,