net-next: mediatek: remove superfluous free_irq() call

Commit 8067302973a1 ("net-next: mediatek: add support for IRQ grouping")
adds handling for irq 1 and 2 to the uninit function but did not remove
irq 0 which is not used since irq grouping was introduced. Fix this by
removing the superfluous call to free_irq().

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: John Crispin <john@phrozen.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index fbab9b2..682797e 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1492,7 +1492,6 @@
 	phy_disconnect(mac->phy_dev);
 	mtk_mdio_cleanup(eth);
 	mtk_irq_disable(eth, ~0);
-	free_irq(eth->irq[0], dev);
 	free_irq(eth->irq[1], dev);
 	free_irq(eth->irq[2], dev);
 }