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Fixed bug #27851 (TCP_EVENT_RECV(pcb, NULL,...) results in unreachable code warning) by calling tcp_recv_null if pcb->recv is null.
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@ -489,11 +489,7 @@ err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
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if((pcb)->recv != NULL) { \
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(ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err)); \
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} else { \
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(ret) = ERR_OK; \
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if (p != NULL) { \
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tcp_recved((pcb), ((struct pbuf*)(p))->tot_len); \
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pbuf_free(p); \
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} \
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(ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
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} \
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} while (0)
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@ -587,6 +583,10 @@ void tcp_zero_window_probe(struct tcp_pcb *pcb);
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u16_t tcp_eff_send_mss(u16_t sendmss, struct ip_addr *addr);
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#endif /* TCP_CALCULATE_EFF_SEND_MSS */
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#if LWIP_CALLBACK_API
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err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
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#endif /* LWIP_CALLBACK_API */
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extern struct tcp_pcb *tcp_input_pcb;
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extern u32_t tcp_ticks;
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