Bluetooth: L2CAP: remove set but not used variable 'credits'

net/bluetooth/l2cap_core.c: In function l2cap_ecred_conn_req:
net/bluetooth/l2cap_core.c:5848:6: warning: variable credits set but not used [-Wunused-but-set-variable]

commit 15f02b91 ("Bluetooth: L2CAP: Add initial code for Enhanced Credit Based Mode")
involved this unused variable, remove it.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap_core.c

@@ -5845,7 +5845,7 @@ static inline int l2cap_ecred_conn_req(struct l2cap_conn *conn,
 		__le16 dcid[5];
 	} __packed pdu;
 	struct l2cap_chan *chan, *pchan;
-	u16 credits, mtu, mps;
+	u16 mtu, mps;
 	__le16 psm;
 	u8 result, len = 0;
 	int i, num_scid;
@@ -5868,7 +5868,6 @@ static inline int l2cap_ecred_conn_req(struct l2cap_conn *conn,
 	}
 
 	psm  = req->psm;
-	credits = 0;
 
 	BT_DBG("psm 0x%2.2x mtu %u mps %u", __le16_to_cpu(psm), mtu, mps);