net: ipv6: rpl_iptunnel: simplify the return expression of rpl_do_srh()

Simplify the return expression.

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

net/ipv6/rpl_iptunnel.c

···
 {
 	struct dst_entry *dst = skb_dst(skb);
 	struct rpl_iptunnel_encap *tinfo;
-	int err = 0;
 
 	if (skb->protocol != htons(ETH_P_IPV6))
 		return -EINVAL;
 
 	tinfo = rpl_encap_lwtunnel(dst->lwtstate);
 
-	err = rpl_do_srh_inline(skb, rlwt, tinfo->srh);
-	if (err)
-		return err;
-
-	return 0;
+	return rpl_do_srh_inline(skb, rlwt, tinfo->srh);
 }
 
 static int rpl_output(struct net *net, struct sock *sk, struct sk_buff *skb)