ALSA: isight: fix leak of reference to firewire unit in error path of .probe callback

[ Upstream commit 51e68fb0929c29e47e9074ca3e99ffd6021a1c5a ]

In some error paths, reference count of firewire unit is not decreased.
This commit fixes the bug.

Fixes: 5b14ec25a79b('ALSA: firewire: release reference count of firewire unit in .remove callback of bus driver')
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
diff --git a/sound/firewire/isight.c b/sound/firewire/isight.c
index 48d6dca..6c8daf5 100644
--- a/sound/firewire/isight.c
+++ b/sound/firewire/isight.c
@@ -639,7 +639,7 @@
 	if (!isight->audio_base) {
 		dev_err(&unit->device, "audio unit base not found\n");
 		err = -ENXIO;
-		goto err_unit;
+		goto error;
 	}
 	fw_iso_resources_init(&isight->resources, unit);
 
@@ -668,12 +668,12 @@
 	dev_set_drvdata(&unit->device, isight);
 
 	return 0;
-
-err_unit:
-	fw_unit_put(isight->unit);
-	mutex_destroy(&isight->mutex);
 error:
 	snd_card_free(card);
+
+	mutex_destroy(&isight->mutex);
+	fw_unit_put(isight->unit);
+
 	return err;
 }