can: ifi: Increment TX counters only on real transmission

Only increment the TX counters in the irq handler if a CAN message
was sent. The current code incremented the counters also if the TX
FIFO empty interrupt happened, which is incorrect.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/ifi_canfd/ifi_canfd.c

@@ -522,13 +522,15 @@ static irqreturn_t ifi_canfd_isr(int irq, void *dev_id)
 	}
 
 	/* TX IRQ */
-	if (isr & tx_irq_mask) {
+	if (isr & IFI_CANFD_INTERRUPT_TXFIFO_REMOVE) {
 		stats->tx_bytes += can_get_echo_skb(ndev, 0);
 		stats->tx_packets++;
 		can_led_event(ndev, CAN_LED_EVENT_TX);
-		netif_wake_queue(ndev);
 	}
 
+	if (isr & tx_irq_mask)
+		netif_wake_queue(ndev);
+
 	return IRQ_HANDLED;
 }