Bluetooth: Remove BKL from open callback of virtual driver

The BKL push down added some BKL into the open callback of the virtual
driver. The driver is really simple and need no such locking and so just
remove it.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_vhci.c

@@ -246,11 +246,9 @@ static int vhci_open(struct inode *inode, struct file *file)
 	skb_queue_head_init(&data->readq);
 	init_waitqueue_head(&data->read_wait);
 
-	lock_kernel();
 	hdev = hci_alloc_dev();
 	if (!hdev) {
 		kfree(data);
-		unlock_kernel();
 		return -ENOMEM;
 	}
 
@@ -271,12 +269,10 @@ static int vhci_open(struct inode *inode, struct file *file)
 		BT_ERR("Can't register HCI device");
 		kfree(data);
 		hci_free_dev(hdev);
-		unlock_kernel();
 		return -EBUSY;
 	}
 
 	file->private_data = data;
-	unlock_kernel();
 
 	return nonseekable_open(inode, file);
 }