Bluetooth: Fix format arguments warning

Newer GCC versions are a little bit picky about how to deal with format
arguments:

net/bluetooth/hci_sysfs.c: In function ‘hci_register_sysfs’:
net/bluetooth/hci_sysfs.c:418: warning: format not a string literal and no format arguments

It is simple enough to fix and makes the compiler happy.
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_sysfs.c

@@ -415,7 +415,7 @@ int hci_register_sysfs(struct hci_dev *hdev)
 	dev->class = bt_class;
 	dev->parent = hdev->parent;
 
-	dev_set_name(dev, hdev->name);
+	dev_set_name(dev, "%s", hdev->name);
 
 	dev_set_drvdata(dev, hdev);