bridge: Use helpers to handle MAC address

Use
	%pM to print MAC
	mac_pton() to convert it from ASCII to binary format, and
	ether_addr_copy() to copy.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_sysfs_br.c

@@ -272,10 +272,7 @@ static ssize_t group_addr_show(struct device *d,
 			       struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
-	return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
-		       br->group_addr[0], br->group_addr[1],
-		       br->group_addr[2], br->group_addr[3],
-		       br->group_addr[4], br->group_addr[5]);
+	return sprintf(buf, "%pM\n", br->group_addr);
 }
 
 static ssize_t group_addr_store(struct device *d,
@@ -284,14 +281,11 @@ static ssize_t group_addr_store(struct device *d,
 {
 	struct net_bridge *br = to_bridge(d);
 	u8 new_addr[6];
-	int i;
 
 	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
 
-	if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
-		   &new_addr[0], &new_addr[1], &new_addr[2],
-		   &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
+	if (!mac_pton(buf, new_addr))
 		return -EINVAL;
 
 	if (!is_link_local_ether_addr(new_addr))
@@ -306,8 +300,7 @@ static ssize_t group_addr_store(struct device *d,
 		return restart_syscall();
 
 	spin_lock_bh(&br->lock);
-	for (i = 0; i < 6; i++)
-		br->group_addr[i] = new_addr[i];
+	ether_addr_copy(br->group_addr, new_addr);
 	spin_unlock_bh(&br->lock);
 
 	br->group_addr_set = true;