enetc: Fix inconsistent IS_ERR and PTR_ERR

The proper pointer to be passed as argument is hw
Detected using Coccinelle.

Fixes: 6517798d ("enetc: Make MDIO accessors more generic and export to include/linux/fsl")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/enetc/enetc_pci_mdio.c

@@ -27,7 +27,7 @@ static int enetc_pci_mdio_probe(struct pci_dev *pdev,
 	}
 
 	hw = enetc_hw_alloc(dev, port_regs);
-	if (IS_ERR(enetc_hw_alloc)) {
+	if (IS_ERR(hw)) {
 		err = PTR_ERR(hw);
 		goto err_hw_alloc;
 	}