sit: ipip6_tunnel_del_prl: return err

Typo. When deleting a PRL entry, return status to userspace
instead of success.
Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/sit.c

@@ -368,7 +368,7 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
 	}
 out:
 	write_unlock(&ipip6_lock);
-	return 0;
+	return err;
 }
 
 static int