sh_eth: sh_eth_close() always returns 0

sh_eth_close() always returns 0, hence the check in sh_eth_wol_restore()
is pointless (however we cannot change the prototype of sh_eth_close() as
it implements the driver's ndo_stop() method).

Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/sh_eth.c

@@ -3444,9 +3444,7 @@ static int sh_eth_wol_restore(struct net_device *ndev)
 	 * both be reset and all registers restored. This is what
 	 * happens during suspend and resume without WoL enabled.
 	 */
-	ret = sh_eth_close(ndev);
-	if (ret < 0)
-		return ret;
+	sh_eth_close(ndev);
 	ret = sh_eth_open(ndev);
 	if (ret < 0)
 		return ret;