ALSA: jack: Fix another NULL dereference due to empty input jack

Another fixes for NULL jack->input_dev in some places in jack.c.

Fixes: 2ba2dfa1fcc7 ('ALSA: hda - Update to use the new jack kctls method')
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/jack.c b/sound/core/jack.c
index 0dbd618..eb66327 100644
--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -87,6 +87,10 @@
 
 	snprintf(jack->name, sizeof(jack->name), "%s %s",
 		 card->shortname, jack->id);
+
+	if (!jack->input_dev)
+		return 0;
+
 	jack->input_dev->name = jack->name;
 
 	/* Default to the sound card device. */
@@ -278,6 +282,8 @@
 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
 {
 	WARN_ON(jack->registered);
+	if (!jack->input_dev)
+		return;
 
 	jack->input_dev->dev.parent = parent;
 }