atm: atmtcp: Constify atmtcp_v_dev_ops

The only usage of atmtcp_v_dev_ops is to pass its address to
atm_dev_register() which takes a pointer to const, and comparing its
address to another address, which does not modify it. Make it const to
allow the compiler to put it in read-only memory.
Signed-off-by: NRikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/atmtcp.c

@@ -327,7 +327,7 @@ static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
  */
 
 
-static struct atmdev_ops atmtcp_v_dev_ops = {
+static const struct atmdev_ops atmtcp_v_dev_ops = {
 	.dev_close	= atmtcp_v_dev_close,
 	.open		= atmtcp_v_open,
 	.close		= atmtcp_v_close,