RTEMS | libtests: Address -Wsign-compare warnings (!925)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/925

Project:Branches: joel/rtems:fix-Wsize-compare-libtests to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill



## Summary

libtests: Address -Wsign-compare warnings

Most of these warnings were between int or ssize_t and size_t.
In particular, read() and write() return ssize_t and comparing
that value with the sizeof a buffer is a source of these warnings.


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