bridge: use kobj_to_dev instead of to_dev

kobj_to_dev has been defined in linux/device.h, so I replace to_dev
with it.

Signed-off-by: Geliang Tang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/bridge/br_sysfs_br.c

···
 
 #include "br_private.h"
 
-#define to_dev(obj)	container_of(obj, struct device, kobj)
 #define to_bridge(cd)	((struct net_bridge *)netdev_priv(to_net_dev(cd)))
 
 /*
···
 			      struct bin_attribute *bin_attr,
 			      char *buf, loff_t off, size_t count)
 {
-	struct device *dev = to_dev(kobj);
+	struct device *dev = kobj_to_dev(kobj);
 	struct net_bridge *br = to_bridge(dev);
 	int n;