RTEMS | shell: Check getcwd() return value in pwd command (!1554)

[xiaojun zheng (@zhengxiaojun)]

xiaojun zheng created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1554

Project:Branches: zhengxiaojun/rtems:fix_pwd to rtems/rtos/rtems:main
Author: xiaojun zheng

## Summary

shell: Check getcwd() return value in pwd command

Check the return value of getcwd() in rtems_shell_main_pwd(). Print the
current working directory only if getcwd() succeeds. Report an error
message with the errno value otherwise. Avoid printing the uninitialized
buffer content when getcwd() fails.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1554
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