ipv6: fix checkpatch errors in net/ipv6/addrconf.c

ERROR: code indent should use tabs where possible: fix 2.
ERROR: do not use assignment in if condition: fix 5.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -2501,7 +2501,8 @@ static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *p
 	if (!dev)
 		return -ENODEV;
 
-	if ((idev = __in6_dev_get(dev)) == NULL)
+	idev = __in6_dev_get(dev);
+	if (!idev)
 		return -ENXIO;
 
 	read_lock_bh(&idev->lock);
@@ -2640,7 +2641,8 @@ static void init_loopback(struct net_device *dev)
 
 	ASSERT_RTNL();
 
-	if ((idev = ipv6_find_idev(dev)) == NULL) {
+	idev = ipv6_find_idev(dev);
+	if (!idev) {
 		pr_debug("%s: add_dev failed\n", __func__);
 		return;
 	}
@@ -2738,7 +2740,8 @@ static void addrconf_sit_config(struct net_device *dev)
 	 * our v4 addrs in the tunnel
 	 */
 
-	if ((idev = ipv6_find_idev(dev)) == NULL) {
+	idev = ipv6_find_idev(dev);
+	if (!idev) {
 		pr_debug("%s: add_dev failed\n", __func__);
 		return;
 	}
@@ -2770,7 +2773,8 @@ static void addrconf_gre_config(struct net_device *dev)
 
 	ASSERT_RTNL();
 
-	if ((idev = ipv6_find_idev(dev)) == NULL) {
+	idev = ipv6_find_idev(dev);
+	if (!idev) {
 		pr_debug("%s: add_dev failed\n", __func__);
 		return;
 	}
@@ -2801,11 +2805,11 @@ static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
 	struct net *net = dev_net(idev->dev);
 
 	/* first try to inherit the link-local address from the link device */
-	if (idev->dev->iflink &&
-	    (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
-		if (!ipv6_inherit_linklocal(idev, link_dev))
+	if (idev->dev->iflink)
+		link_dev = __dev_get_by_index(net, idev->dev->iflink);
+		if (link_dev && !ipv6_inherit_linklocal(idev, link_dev))
 			return;
-	}
+
 	/* then try to inherit it from any device */
 	for_each_netdev(net, link_dev) {
 		if (!ipv6_inherit_linklocal(idev, link_dev))