net/ethoc: do not free array priv->mdio->irq

priv->mdio->irq used to be allocated and required freeing, but it
is now a fixed sized array and should no longer be free'd.

Issue detected using static analysis with CoverityScan

Fixes: e7f4dc3536a400 ("mdio: Move allocation of interrupts into core")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Tobias Klauser <tklauser@distanz.ch>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
index 62fa136..41b0106 100644
--- a/drivers/net/ethernet/ethoc.c
+++ b/drivers/net/ethernet/ethoc.c
@@ -1265,7 +1265,6 @@
 
 		if (priv->mdio) {
 			mdiobus_unregister(priv->mdio);
-			kfree(priv->mdio->irq);
 			mdiobus_free(priv->mdio);
 		}
 		if (priv->clk)