fix: release1.0.1分支解决多进程情况下，pipe的内核操作节点存在使用脏私有字段dev，导致系统概率异常问题

问题场景描述：
(1)进程A使用pipe获取操作fd，然后循环使用poll操作;
(2)kill正在进行poll操作的进程A, pipe的fd会被回收，当pipe的设备节点未注销；
(3)进程B使用pipe获取操作fd，此时获取的内核操作节点为进程A创建的，存在使用进程A的操作节点的私有字段。
解决方案：pipe每次调用如果操作节点存在，就更新私有字段。

master分支已解决该问题。
Signed-off-by: Nwanghao-free <wanghao453@huawei.com>

drivers/pipes/pipe.c

@@ -48,6 +48,7 @@
 #include <fs/fs.h>
 
 #include "pipe_common.h"
+#include "inode/inode.h"
 #include "stdio.h"
 #if CONFIG_DEV_PIPE_SIZE > 0
 
@@ -226,6 +227,42 @@ static int pipe_unlink(FAR struct inode *priv)
  *
  ****************************************************************************/
 
+static void UpdateDev(struct pipe_dev_s *dev)
+{
+    FAR struct inode *node;
+    struct pipe_dev_s *olddev = NULL;
+
+    struct inode_search_s desc;
+    SETUP_SEARCH(&desc, dev->name, fasle);
+    FAR const char *path = desc.path;
+    FAR const char **relpath = &(desc.relpath);
+    FAR struct inode **peer = &(desc.peer);
+    FAR struct inode **parent = &(desc.parent);
+
+    inode_semtake();
+    desc.node = inode_search(&path, peer, parent, relpath);
+    if (desc.node == NULL)
+    {
+        inode_semgive();
+        PRINT_ERR("[%s,%d] failed.\n", __FUNCTION__, __LINE__);
+        return;
+    }
+    node = desc.node;
+    olddev = (struct pipe_dev_s *)node->i_private;
+    if (olddev != NULL)
+    {
+        if (olddev->d_buffer != NULL)
+        {
+            free(olddev->d_buffer);
+            olddev->d_buffer = NULL;
+        }
+        pipecommon_freedev(olddev);
+    }
+    node->i_private = dev;
+    inode_semgive();
+    return;
+}
+
 int pipe(int fd[2])
 {
     FAR struct pipe_dev_s *dev = NULL;
@@ -258,10 +295,6 @@ int pipe(int fd[2])
 
     snprintf_s(devname, sizeof(devname), sizeof(devname) - 1, "/dev/pipe%d", pipeno);
 
-  /* Check if the pipe device has already been created */
-
-  if ((g_pipecreated & (1 << pipeno)) == 0)
-    {
     /* No.. Allocate and initialize a new device structure instance */
 
     dev = pipecommon_allocdev(bufsize, devname);
@@ -274,6 +307,10 @@ int pipe(int fd[2])
 
     dev->d_pipeno = pipeno;
 
+    /* Check if the pipe device has already been created */
+
+    if ((g_pipecreated & (1 << pipeno)) == 0)
+    {
         /* Register the pipe device */
 
         ret = register_driver(devname, &pipe_fops, 0660, (FAR void *)dev);
@@ -288,6 +325,10 @@ int pipe(int fd[2])
 
         g_pipecreated |= (1 << pipeno);
     }
+    else
+    {
+        UpdateDev(dev);
+    }
 
     (void)sem_post(&g_pipesem);