[SAL/SOCKET]修复在 RT_DEBUG 开启后，调用 closesocket 接口触发断言的 BUG

components/net/sal/socket/net_sockets.c

@@ -311,7 +311,6 @@ int closesocket(int s)
         error = -1;
     }
 
-    rt_free(d->vnode);
     /* socket has been closed, delete it from file system fd */
     fd_release(s);