net: Use kobj_to_dev() API

Use kobj_to_dev() instead of container_of().

Signed-off-by: Wang Qing <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/phy/spi_ks8995.c

···
 	struct device *dev;
 	struct ks8995_switch *ks8995;
 
-	dev = container_of(kobj, struct device, kobj);
+	dev = kobj_to_dev(kobj);
 	ks8995 = dev_get_drvdata(dev);
 
 	return ks8995_read(ks8995, buf, off, count);
···
 	struct device *dev;
 	struct ks8995_switch *ks8995;
 
-	dev = container_of(kobj, struct device, kobj);
+	dev = kobj_to_dev(kobj);
 	ks8995 = dev_get_drvdata(dev);
 
 	return ks8995_write(ks8995, buf, off, count);