firewire: core: Remove card from list of cards when enable fails

Signed-off-by: Petr Vandrovec <[e-mail]>

After a controller initialization failure, addition of another card got
stuck due to card_list corruption.

Signed-off-by: Stefan Richter <[e-mail]>

drivers/firewire/fw-card.c

···
 {
 	u32 *config_rom;
 	size_t length;
+	int err;
 
 	card->max_receive = max_receive;
 	card->link_speed = link_speed;
···
 	list_add_tail(&card->link, &card_list);
 	mutex_unlock(&card_mutex);
 
-	return card->driver->enable(card, config_rom, length);
+	err = card->driver->enable(card, config_rom, length);
+	if (err < 0) {
+		mutex_lock(&card_mutex);
+		list_del(&card->link);
+		mutex_unlock(&card_mutex);
+	}
+	return err;
 }
 EXPORT_SYMBOL(fw_card_add);