ALSA: ASoC: Export dapm_reg_event() fully

dapm_reg_event() is used by devices using SND_SOC_DAPM_REG() so needs to
be exported to support building them as modules and prototyped to avoid
sparse warnings and potential build issues.

Signed-off-by: Mark Brown <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/sound/soc-dapm.h

···
 struct snd_soc_dapm_pin;
 struct snd_soc_dapm_route;
 
+int dapm_reg_event(struct snd_soc_dapm_widget *w,
+		   struct snd_kcontrol *kcontrol, int event);
+
 /* dapm controls */
 int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol,
 	struct snd_ctl_elem_value *ucontrol);

sound/soc/soc-dapm.c

···
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(dapm_reg_event);
 
 /*
  * Scan each dapm widget for complete audio path.