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

net/ipv6/rpl_iptunnel.c

···
 	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);