net: fman: memac: Uninitialized variable on error path

The "fixed_link" is only allocated sometimes but it's freed
unconditionally in the error handling. Set it to NULL so we don't free
uninitialized data.

Fixes: 9ea4742a55ca ("net: fman: Configure fixed link in memac_initialization")
Signed-off-by: Dan Carpenter <[e-mail]>
Reviewed-by: Sean Anderson <[e-mail]>
Link: https://lore.kernel.org/r/Ywd2X6gdKmTfYBxD@kili
Signed-off-by: Jakub Kicinski <[e-mail]>

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

···
 {
 	int			 err;
 	struct fman_mac_params	 params;
-	struct fixed_phy_status *fixed_link;
+	struct fixed_phy_status *fixed_link = NULL;
 
 	mac_dev->set_promisc		= memac_set_promiscuous;
 	mac_dev->change_addr		= memac_modify_mac_address;