RTEMS | shell/cat_file:Fix cat not outputting file with no newline at end (!219)

[shuhua hua (@huangshuhua)]

shuhua hua created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/219

Project:Branches: huangshuhua/rtems:huangshuhua-main-patch-33450 to rtems/rtos/rtems:main
Author:   shuhua hua




## Summary

The phenomenon is that when I create a file, such as 123.txt, in the root directory using the edit command, and type some content without pressing Enter to add a newline at the end, upon saving with F9, I can see the file 123.txt exists when using the ls command. However, when I try to view the content with the cat command, nothing is output.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/219
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