ipv6: remove superfluous nla_data() NULL pointer checks

nla_data() cannot return NULL, so these NULL pointer checks are
superfluous.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrlabel.c

@@ -436,10 +436,7 @@ static int ip6addrlbl_newdel(struct sk_buff *skb, struct nlmsghdr *nlh,
 
 	if (!tb[IFAL_ADDRESS])
 		return -EINVAL;
-
 	pfx = nla_data(tb[IFAL_ADDRESS]);
-	if (!pfx)
-		return -EINVAL;
 
 	if (!tb[IFAL_LABEL])
 		return -EINVAL;
@@ -561,10 +558,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 
 	if (!tb[IFAL_ADDRESS])
 		return -EINVAL;
-
 	addr = nla_data(tb[IFAL_ADDRESS]);
-	if (!addr)
-		return -EINVAL;
 
 	rcu_read_lock();
 	p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);