fs_lock:Fixed the problem that in multi-threaded situations, the bucket may be deleted by other factors during the search process, resulting in assertion.

hsearch_r（item = （key = 0x61492174,data = ？），action = ？， retval = 0x6266AC44, htab = 0x6159B758） H 1tem = Ckey = 0x61492174, data= ：
 · action = ？
  retval = 0x6266AC44
  htab = 0x6159B758
  haad - 0x61616300
  ie= 0×38

file_lock_find_bucket（inline）
  filepath = 0x61492174
  hretvalue = 0x6055991D
  item = （key = 0x61492174, data = 0x0）

Signed-off-by: chenrun1 <[email protected]>

Author: crafcat7

fs/vfs/fs_lock.c

@@ -767,15 +767,16 @@ void file_closelk(FAR struct file *filep)
       goto out;
     }
 
+  nxmutex_lock(&g_protect_lock);
   bucket = file_lock_find_bucket(path);
   if (bucket == NULL)
     {
       /* There is no bucket here, so we don't need to free it. */
 
+      nxmutex_unlock(&g_protect_lock);
       goto out;
     }
 
-  nxmutex_lock(&g_protect_lock);
   list_for_every_entry_safe(&bucket->list, file_lock, temp,
                             struct file_lock_s, fl_node)
     {