Merge pull request #2526 from BernardXiong/fix_pipe

[libc] Fix the unamed pipe close issue

components/drivers/include/ipc/pipe.h

@@ -24,6 +24,7 @@
 struct rt_pipe_device
 {
     struct rt_device parent;
+    rt_bool_t is_named;
 
     /* ring buffer in pipe device */
     struct rt_ringbuffer *fifo;