ALSA: core: Remove unused snd_jack_set_parent

snd_jack_set_parent() was added as part of 2008's
commit e76d8ceaaff9 ("ALSA: Add jack reporting API")

but hasn't been used.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

include/sound/jack.h

···
 		 struct snd_jack **jack, bool initial_kctl, bool phantom_jack);
 int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask);
 #ifdef CONFIG_SND_JACK_INPUT_DEV
-void snd_jack_set_parent(struct snd_jack *jack, struct device *parent);
 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
 		     int keytype);
 #endif
···
 #endif
 
 #if !defined(CONFIG_SND_JACK) || !defined(CONFIG_SND_JACK_INPUT_DEV)
-static inline void snd_jack_set_parent(struct snd_jack *jack,
-				       struct device *parent)
-{
-}
-
 static inline int snd_jack_set_key(struct snd_jack *jack,
 				   enum snd_jack_types type,
 				   int keytype)

sound/core/jack.c

···
 
 #ifdef CONFIG_SND_JACK_INPUT_DEV
 /**
- * snd_jack_set_parent - Set the parent device for a jack
- *
- * @jack:   The jack to configure
- * @parent: The device to set as parent for the jack.
- *
- * Set the parent for the jack devices in the device tree.  This
- * function is only valid prior to registration of the jack.  If no
- * parent is configured then the parent device will be the sound card.
- */
-void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
-{
-	WARN_ON(jack->registered);
-	guard(mutex)(&jack->input_dev_lock);
-	if (jack->input_dev)
-		jack->input_dev->dev.parent = parent;
-}
-EXPORT_SYMBOL(snd_jack_set_parent);
-
-/**
  * snd_jack_set_key - Set a key mapping on a jack
  *
  * @jack:    The jack to configure