When insert =/**/= comment in a C-src block, "," will be
insert automticlly before =*= as flow:
[[file:/home/pk/rdf/redef/repos/rdf-mix/roam/emacs_org_issue.png]]

Reproduce:
1. Create one new .org file
2. Insert this content:
   #+BEGIN_EXAMPLE
   #+BEGIN_SRC C  
   /** @file  main.c
    * @brief  项目主函数文件
    * @details 主要包含协议应用栈程序框架，main函数入口
    * @author 李长条
    * @copyright Copyright (c) 2050
    */
   #+END_SRC
   #+END_EXAMPLE
3. In this block, type =C-c '=,which will call "org-edit-special"
4. In the opened =*Org Src *= buffer, do nothing and type =C-c '= again
5. Then the "," are inserted in org file as shown in previous picture.