sfc: fix W=1 warnings in efx_farch_handle_rx_not_ok

Some of these RX-event flags aren't used at all, so remove them.
Others are used only #ifdef DEBUG to log a message; suppress the
 unused-var warnings #ifndef DEBUG with a void cast.
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/farch.c

@@ -863,13 +863,8 @@ static u16 efx_farch_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
 	bool rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err;
 	bool rx_ev_frm_trunc, rx_ev_tobe_disc;
 	bool rx_ev_other_err, rx_ev_pause_frm;
-	bool rx_ev_hdr_type, rx_ev_mcast_pkt;
-	unsigned rx_ev_pkt_type;
 
-	rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE);
-	rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT);
 	rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC);
-	rx_ev_pkt_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_TYPE);
 	rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event,
 						 FSF_AZ_RX_EV_BUF_OWNER_ID_ERR);
 	rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event,
@@ -918,6 +913,8 @@ static u16 efx_farch_handle_rx_not_ok(struct efx_rx_queue *rx_queue,
 			  rx_ev_tobe_disc ? " [TOBE_DISC]" : "",
 			  rx_ev_pause_frm ? " [PAUSE]" : "");
 	}
+#else
+	(void) rx_ev_other_err;
 #endif
 
 	if (efx->net_dev->features & NETIF_F_RXALL)