[SCSI] target: fixed missing lock drop in error path

The struct se_node_acl->device_list_lock needs to be released if either
sanity check for struct se_dev_entry->se_lun_acl or deve->se_lun fails.
Signed-off-by: Fubo Chen <fubo.chen@gmail.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/target/target_core_device.c

@@ -395,12 +395,14 @@ int core_update_device_list_for_node(
 				printk(KERN_ERR "struct se_dev_entry->se_lun_acl"
 					" already set for demo mode -> explict"
 					" LUN ACL transition\n");
+				spin_unlock_irq(&nacl->device_list_lock);
 				return -1;
 			}
 			if (deve->se_lun != lun) {
 				printk(KERN_ERR "struct se_dev_entry->se_lun does"
 					" match passed struct se_lun for demo mode"
 					" -> explict LUN ACL transition\n");
+				spin_unlock_irq(&nacl->device_list_lock);
 				return -1;
 			}
 			deve->se_lun_acl = lun_acl;