fix:编译报错

components/ethernet/w5500/w5500.c

@@ -704,7 +704,7 @@ static void w5500_link_state(w5500_ctrl_t *w5500, uint8_t check_state)
 				uint8_t temp[1];
 				temp[0] = MR_UDP_FARP;
 				w5500_xfer(w5500, W5500_COMMON_MR, is_write, temp, 1);
-				result = ip4_dhcp_run(&w5500->dhcp_client, NULL, &tx_msg_buf, &remote_ip);
+				ip4_dhcp_run(&w5500->dhcp_client, NULL, &tx_msg_buf, &remote_ip);
 				w5500_check_dhcp(w5500);
 				if (tx_msg_buf.Pos)
 				{