net: ipv6: rpl_iptunnel: remove redundant assignments to variable err

The variable err is being initialized with a value that is never
read and it is being updated later with a new value.  The initialization
is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/rpl_iptunnel.c

@@ -210,7 +210,7 @@ static int rpl_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 	struct dst_entry *orig_dst = skb_dst(skb);
 	struct dst_entry *dst = NULL;
 	struct rpl_lwt *rlwt;
-	int err = -EINVAL;
+	int err;
 
 	rlwt = rpl_lwt_lwtunnel(orig_dst->lwtstate);