Fixed two compilation errors with different opt.h settings

src/api/sockets.c

@@ -908,10 +908,10 @@ lwip_sendto(int s, const void *data, size_t size, int flags,
 #if LWIP_UDP
 #if LWIP_CHECKSUM_ON_COPY && LWIP_NETIF_TX_SINGLE_PBUF
         err = sock->conn->last_err = udp_sendto_chksum(sock->conn->pcb.udp, p,
-          remote_addr, remote_port, 1, chksum);
+          ipX_2_ip(remote_addr), remote_port, 1, chksum);
 #else /* LWIP_CHECKSUM_ON_COPY && LWIP_NETIF_TX_SINGLE_PBUF */
         err = sock->conn->last_err = udp_sendto(sock->conn->pcb.udp, p,
-          remote_addr, remote_port);
+          ipX_2_ip(remote_addr), remote_port);
 #endif /* LWIP_CHECKSUM_ON_COPY && LWIP_NETIF_TX_SINGLE_PBUF */
 #else /* LWIP_UDP */
         err = ERR_ARG;

src/core/tcp_out.c

@@ -1169,7 +1169,6 @@ tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb)
   seg->tcphdr->chksum = ipX_chksum_pseudo(PCB_ISIPV6(pcb), seg->p, IP_PROTO_TCP,
     seg->p->tot_len, &pcb->local_ip, &pcb->remote_ip);
 #endif /* CHECKSUM_GEN_TCP */
-  }
 #endif /* TCP_CHECKSUM_ON_COPY */
   TCP_STATS_INC(tcp.xmit);