NFC: HCI ops should not be exposed globally

The variable 'hci_nfc_ops' is only referenced in this file and
should be marked static to prevent it from being exposed globally.

Quites the sparse warning:

warning: symbol 'hci_nfc_ops' was not declared. Should it be static?

Signed-off-by: H Hartley Sweeten <[e-mail]>
Cc: Lauro Ramos Venancio <[e-mail]>
Cc: Aloisio Almeida Jr <[e-mail]>
Cc: Samuel Ortiz <[e-mail]>
Cc: "David S. Miller" <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

net/nfc/hci/core.c

···
 	return 0;
 }
 
-struct nfc_ops hci_nfc_ops = {
+static struct nfc_ops hci_nfc_ops = {
 	.dev_up = hci_dev_up,
 	.dev_down = hci_dev_down,
 	.start_poll = hci_start_poll,