RTEMS | Fix panic issue which caused by pipe. (!267)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/267

Project:Branches: yang.zhang/rtems:panic_in_pipe to rtems/rtos/rtems:main
Author:   yang zhang




## Summary

Fix panic issue which caused by pipe.

When dup fd, should also clone fctnl flags.
Also should check NULL param in pipe_* funcs.

I also modify the original pipe test case so that it can reproduce this issue.

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