net: nfc: nci: drop nci_uart_default_recv

nci_uart_register returns -EINVAL immediately when nu->ops.recv is not
set. So the same 'if' later never triggers so nci_uart_default_recv is
never used. Drop it.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-17-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/nfc/nci/uart.c

@@ -387,12 +387,6 @@ static int nci_uart_send(struct nci_uart *nu, struct sk_buff *skb)
 	return 0;
 }
 
-/* -- Default recv handler -- */
-static int nci_uart_default_recv(struct nci_uart *nu, struct sk_buff *skb)
-{
-	return nci_recv_frame(nu->ndev, skb);
-}
-
 int nci_uart_register(struct nci_uart *nu)
 {
 	if (!nu || !nu->ops.open ||
@@ -402,10 +396,6 @@ int nci_uart_register(struct nci_uart *nu)
 	/* Set the send callback */
 	nu->ops.send = nci_uart_send;
 
-	/* Install default handlers if not overridden */
-	if (!nu->ops.recv)
-		nu->ops.recv = nci_uart_default_recv;
-
 	/* Add this driver in the driver list */
 	if (nci_uart_drivers[nu->driver]) {
 		pr_err("driver %d is already registered\n", nu->driver);