RTEMS | cpukit/libblock: Close all valid FDs (!186)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/186

Project:Branches: opticron/rtems:fix-fd-check to rtems/rtos/rtems:main
Author:   Kinsey Moore
Assignee: Kinsey Moore
Reviewer: Joel Sherrill


## Summary

cpukit/libblock: Close all valid FDs

This is intended to close any valid FDs that were opened, but 0 is also
a valid FD. This change ensures that a FD of 0 is also closed properly.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/186
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