net: r6040: Utilize __napi_schedule_irqoff

We are already in hard IRQ context, so we can use
__napi_schedule_irqoff() to save a few operations.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/rdc/r6040.c

@@ -690,7 +690,7 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
 		if (likely(napi_schedule_prep(&lp->napi))) {
 			/* Mask off RX interrupt */
 			misr &= ~(RX_INTS | TX_INTS);
-			__napi_schedule(&lp->napi);
+			__napi_schedule_irqoff(&lp->napi);
 		}
 	}