eth: sp7021: drop free_netdev() from spl2sw_init_netdev()

It's not necessary to free netdev allocated with devm_alloc_etherdev()
and using free_netdev() leads to double free.

Fixes: fd3040b9 ("net: ethernet: Add driver for Sunplus SP7021")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Link: https://lore.kernel.org/r/20221109150116.2988194-1-weiyongjun@huaweicloud.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sunplus/spl2sw_driver.c

@@ -287,7 +287,6 @@ static u32 spl2sw_init_netdev(struct platform_device *pdev, u8 *mac_addr,
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to register net device \"%s\"!\n",
 			ndev->name);
-		free_netdev(ndev);
 		*r_ndev = NULL;
 		return ret;
 	}