ASoC: Fix snd_soc_kcontrol_platform() return type

This should obviously be snd_soc_platform * and not snd_soc_codec *

Fixes: f6272ff8 ("ASoC: Add snd_soc_kcontrol_platform() helper function")
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NMark Brown <broonie@linaro.org>

include/sound/soc.h

@@ -1253,7 +1253,7 @@ static inline struct snd_soc_codec *snd_soc_kcontrol_codec(
  * registered with snd_soc_add_platform_controls() or via table based setup of
  * a snd_soc_platform_driver. Otherwise the behavior is undefined.
  */
-static inline struct snd_soc_codec *snd_soc_kcontrol_platform(
+static inline struct snd_soc_platform *snd_soc_kcontrol_platform(
 	struct snd_kcontrol *kcontrol)
 {
 	return snd_kcontrol_chip(kcontrol);