ALSA: control: Fix leftover snd_power_unref()

One snd_power_unref() was forgotten and left at __snd_ctl_elem_info()
in the previous change for reorganizing the locking order.

Fixes: fcc62b1 ("ALSA: control: Take power_ref lock primarily")
Link: #5127
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/control.c

@@ -1168,7 +1168,6 @@ static int __snd_ctl_elem_info(struct snd_card *card,
 	info->access = 0;
 #endif
 	result = kctl->info(kctl, info);
-	snd_power_unref(card);
 	if (result >= 0) {
 		snd_BUG_ON(info->access);
 		index_offset = snd_ctl_get_ioff(kctl, &info->id);