net: dsa: remove redundant null pointer check before put_device

put_device has taken the null pinter check into account. So it is
safe to remove the duplicated check before put_device.
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/legacy.c

@@ -392,7 +392,6 @@ static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 		}
 
 		/* Drop our reference to the MDIO bus device */
-		if (pd->chip[i].host_dev)
 		put_device(pd->chip[i].host_dev);
 	}
 	kfree(pd->chip);