ar71xx: fix mii bus irq assignment

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h

@@ -116,7 +116,9 @@ struct ag71xx_ring {
 
 struct ag71xx_mdio {
 	struct mii_bus		*mii_bus;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 	int			mii_irq[PHY_MAX_ADDR];
+#endif
 	void __iomem		*mdio_base;
 	struct ag71xx_mdio_platform_data *pdata;
 };

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_mdio.c

@@ -256,8 +256,6 @@ static int ag71xx_mdio_probe(struct platform_device *pdev)
 	am->mii_bus->reset = ag71xx_mdio_reset;
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 	am->mii_bus->irq = am->mii_irq;
-#else
-	memcpy(am->mii_bus->irq, am->mii_irq, sizeof(am->mii_bus->irq));
 #endif
 	am->mii_bus->priv = am;
 	am->mii_bus->parent = &pdev->dev;
@@ -265,7 +263,7 @@ static int ag71xx_mdio_probe(struct platform_device *pdev)
 	am->mii_bus->phy_mask = pdata->phy_mask;
 
 	for (i = 0; i < PHY_MAX_ADDR; i++)
-		am->mii_irq[i] = PHY_POLL;
+		am->mii_bus->irq[i] = PHY_POLL;
 
 	ag71xx_mdio_wr(am, AG71XX_REG_MAC_CFG1, 0);