Bluetooth: 6lowpan: delete unneeded variable initialization

Delete unneeded variable initialization.
Signed-off-by: NKai Ye <yekai13@huawei.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/6lowpan.c

@@ -691,7 +691,7 @@ static struct l2cap_chan *add_peer_chan(struct l2cap_chan *chan,
 static int setup_netdev(struct l2cap_chan *chan, struct lowpan_btle_dev **dev)
 {
 	struct net_device *netdev;
-	int err = 0;
+	int err;
 
 	netdev = alloc_netdev(LOWPAN_PRIV_SIZE(sizeof(struct lowpan_btle_dev)),
 			      IFACE_NAME_TEMPLATE, NET_NAME_UNKNOWN,