Bluetooth: Remove unnecessary variable initialization

The initial value of err is not used until it is set to -ENOMEM. So just
remove the initialization completely.

Based on a patch from Gustavo F. Padovan <gustavo@las.ic.unicamp.br>

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index c0c0915..77e6715 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -844,7 +844,7 @@
 	struct hci_conn *hcon;
 	struct hci_dev *hdev;
 	__u8 auth_type;
-	int err = 0;
+	int err;
 
 	BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
 							l2cap_pi(sk)->psm);