lwip: remove useless printf info

components/lwip/port/netif/wlanif.c

@@ -130,7 +130,6 @@ low_level_output(struct netif *netif, struct pbuf *p)
         ret = esp_wifi_internal_tx(wifi_if, q->payload, q->len);
     } else {
         LWIP_DEBUGF(PBUF_DEBUG, ("low_level_output: pbuf is a list, application may has bug"));
-        printf("low level_output: len=%d\n", p->tot_len);
         q = pbuf_alloc(PBUF_RAW_TX, p->tot_len, PBUF_RAM);
         if (q != NULL) {
             pbuf_copy(q, p);