Bluetooth: Make hci_send_sco() void

It also removes an unneeded check for the MTU. The check is done before
on sco_send_frame()

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index b406d3e..541b26e 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -249,8 +249,7 @@
 		goto fail;
 	}
 
-	if ((err = hci_send_sco(conn->hcon, skb)) < 0)
-		return err;
+	hci_send_sco(conn->hcon, skb);
 
 	return count;