eth: sp7021: fix use after free bug in spl2sw_nvmem_get_mac_address

This frees "mac" and tries to display its address as part of the error
message on the next line.  Swap the order.

Fixes: fd3040b9 ("net: ethernet: Add driver for Sunplus SP7021")
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sunplus/spl2sw_driver.c

@@ -248,8 +248,8 @@ static int spl2sw_nvmem_get_mac_address(struct device *dev, struct device_node *
 
 	/* Check if mac address is valid */
 	if (!is_valid_ether_addr(mac)) {
-		kfree(mac);
 		dev_info(dev, "Invalid mac address in nvmem (%pM)!\n", mac);
+		kfree(mac);
 		return -EINVAL;
 	}