Bluetooth: Remove unnecessary l2cap_chan_unlock before l2cap_chan_add

The l2cap_chan_add() function doesn't require the channel to be
unlocked. It only requires the l2cap_conn to be unlocked. Therefore,
it's unnecessary to unlock a channel before calling l2cap_chan_add().
This patch removes such unnecessary unlocking from the
l2cap_chan_connect() function.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap_core.c

@@ -7078,9 +7078,7 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 	bacpy(&chan->src, &hcon->src);
 	chan->src_type = bdaddr_type(hcon, hcon->src_type);
 
-	l2cap_chan_unlock(chan);
 	l2cap_chan_add(conn, chan);
-	l2cap_chan_lock(chan);
 
 	/* l2cap_chan_add takes its own ref so we can drop this one */
 	hci_conn_drop(hcon);