net/local: fix used after free

now the lc_path of the client will not be the same as that of the server.
therefore, accept->peer = NULL will not be set when the client release
the conn, then when release accept conn, set
client->peer(accept->peer->peer) = NULL will cause used after free

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>

net/local/local_conn.c

@@ -299,7 +299,7 @@ void local_free(FAR struct local_conn_s *conn)
 
   dq_rem(&conn->lc_conn.node, &g_local_connections);
 
-  if (local_peerconn(conn) && conn->lc_peer)
+  if (conn->lc_peer)
     {
       conn->lc_peer->lc_peer = NULL;
       conn->lc_peer = NULL;