net: fman: memac: free mdio device if lynx_pcs_create() fails

When memory allocation fails in lynx_pcs_create() and it returns NULL,
there remains a dangling reference to the mdiodev returned by
of_mdio_find_device() which is leaked as soon as memac_pcs_create()
returns empty-handed.

Fixes: a7c2a32e ("net: fman: memac: Use lynx pcs driver")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Sean Anderson <sean.anderson@seco.com>
Acked-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Link: https://lore.kernel.org/r/20230130193051.563315-1-vladimir.oltean@nxp.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/freescale/fman/fman_memac.c

@@ -1055,6 +1055,9 @@ static struct phylink_pcs *memac_pcs_create(struct device_node *mac_node,
 		return ERR_PTR(-EPROBE_DEFER);
 
 	pcs = lynx_pcs_create(mdiodev);
+	if (!pcs)
+		mdio_device_free(mdiodev);
+
 	return pcs;
 }