ravb: Add missing free_irq() calls to ravb_close()

When reopening the network device on ra7795/salvator-x, e.g. after a
DHCP timeout:

    IP-Config: Reopening network devices...
    genirq: Flags mismatch irq 139. 00000000 (eth0:ch0:rx_be) vs. 00000000 (ravb e6800000.ethernet eth0: cannot request IRQ eth0:ch0:rx_be
    IP-Config: Failed to open eth0
    IP-Config: No network devices available

The "mismatch" is due to requesting an IRQ that is already in use,
while IRQF_PROBE_SHARED wasn't set.

However, the real cause is that ravb_close() doesn't release any of the
R-Car Gen3-specific secondary IRQs.

Add the missing free_irq() calls to fix this.

Fixes: f51bdc23 ("ravb: Add dma queue interrupt support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb_main.c

@@ -1667,8 +1667,13 @@ static int ravb_close(struct net_device *ndev)
 		priv->phydev = NULL;
 	}
 
-	if (priv->chip_id == RCAR_GEN3)
+	if (priv->chip_id != RCAR_GEN2) {
+		free_irq(priv->tx_irqs[RAVB_NC], ndev);
+		free_irq(priv->rx_irqs[RAVB_NC], ndev);
+		free_irq(priv->tx_irqs[RAVB_BE], ndev);
+		free_irq(priv->rx_irqs[RAVB_BE], ndev);
 		free_irq(priv->emac_irq, ndev);
+	}
 	free_irq(ndev->irq, ndev);
 
 	napi_disable(&priv->napi[RAVB_NC]);