net: lan966x: Fix spelling mistake "tarffic" -> "traffic"

There is a spelling mistake in a netdev_err message. Fix it.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/lan966x/lan966x_mqprio.c

@@ -7,7 +7,7 @@ int lan966x_mqprio_add(struct lan966x_port *port, u8 num_tc)
 	u8 i;
 
 	if (num_tc != NUM_PRIO_QUEUES) {
-		netdev_err(port->dev, "Only %d tarffic classes supported\n",
+		netdev_err(port->dev, "Only %d traffic classes supported\n",
 			   NUM_PRIO_QUEUES);
 		return -EINVAL;
 	}