net/soerr: add new _SO_CONN_SETERRNO() macro

support so error code set from conn instance

Signed-off-by: chao an <anchao@xiaomi.com>

net/tcp/tcp_monitor.c

@@ -165,10 +165,7 @@ static uint16_t tcp_monitor_event(FAR struct net_driver_s *dev,
 
           /* Clear the socket error */
 
-#ifdef CONFIG_NET_SOCKOPTS
-          conn->sconn.s_error = OK;
-#endif
-          set_errno(OK);
+          _SO_CONN_SETERRNO(conn, OK);
 
           /* Indicate that the socket is now connected */
 

net/tcp/tcp_netpoll.c

@@ -128,10 +128,7 @@ static uint16_t tcp_poll_eventhandler(FAR struct net_driver_s *dev,
               reason = ECONNREFUSED;
             }
 
-#ifdef CONFIG_NET_SOCKOPTS
-          info->conn->sconn.s_error = reason;
-#endif
-          set_errno(reason);
+          _SO_CONN_SETERRNO(info->conn, reason);
 
           /* Mark that the connection has been lost */