Bluetooth: Make the function sco_conn_del have a return type of void

This makes the function sco_conn_del have a return type of void now
due to this function always running successfully and thus never
needing to signal its caller when a non recoverable internal failure
occurs by returning a error code to its respective caller.
Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/sco.c

@@ -154,13 +154,13 @@ static void sco_chan_del(struct sock *sk, int err)
 	sock_set_flag(sk, SOCK_ZAPPED);
 }
 
-static int sco_conn_del(struct hci_conn *hcon, int err)
+static void sco_conn_del(struct hci_conn *hcon, int err)
 {
 	struct sco_conn *conn = hcon->sco_data;
 	struct sock *sk;
 
 	if (!conn)
-		return 0;
+		return;
 
 	BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
 
@@ -179,7 +179,6 @@ static int sco_conn_del(struct hci_conn *hcon, int err)
 
 	hcon->sco_data = NULL;
 	kfree(conn);
-	return 0;
 }
 
 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)