ASoC: cleanup duplicated code.

Many codec drivers were implementing cookie-cutter copies of the function
that adds kcontrols to the codec.

This patch moves this code to a common function snd_soc_add_controls() in
soc-core.c and updates all drivers using copies of this function to use the
new common version.

[Edited to raise priority of error log message and document parameters.
 -- broonie]

Signed-off-by: Ian Molton <ian@mnementh.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm9712.c

@@ -154,21 +154,6 @@ SOC_SINGLE("Mic 2 Volume", AC97_MIC, 0, 31, 1),
 SOC_SINGLE("Mic 20dB Boost Switch", AC97_MIC, 7, 1, 0),
 };
 
-/* add non dapm controls */
-static int wm9712_add_controls(struct snd_soc_codec *codec)
-{
-	int err, i;
-
-	for (i = 0; i < ARRAY_SIZE(wm9712_snd_ac97_controls); i++) {
-		err = snd_ctl_add(codec->card,
-				  snd_soc_cnew(&wm9712_snd_ac97_controls[i],
-					       codec, NULL));
-		if (err < 0)
-			return err;
-	}
-	return 0;
-}
-
 /* We have to create a fake left and right HP mixers because
  * the codec only has a single control that is shared by both channels.
  * This makes it impossible to determine the audio path.
@@ -698,7 +683,8 @@ static int wm9712_soc_probe(struct platform_device *pdev)
 	ac97_write(codec, AC97_VIDEO, ac97_read(codec, AC97_VIDEO) | 0x3000);
 
 	wm9712_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
-	wm9712_add_controls(codec);
+	snd_soc_add_controls(codec, wm9712_snd_ac97_controls,
+				ARRAY_SIZE(wm9712_snd_ac97_controls));
 	wm9712_add_widgets(codec);
 	ret = snd_soc_init_card(socdev);
 	if (ret < 0) {