RTEMS | testsuites misc: Address -Wsign-compare warnings (!933)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/933

Project:Branches: joel/rtems:fix-misc-tests-sign-compare-warnings to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill



## Summary

testsuites/samples/fileio/init.c: Address -Wsign-compare warnings

Most of these warnings were between int or ssize_t and size_t.
In particular, various POSIX system calls like read() and write()
return ssize_t and comparing that value with the sizeof a buffer
is a common source of these warnings. Another common source is
using an int as the iterator in a for loop with the limit being
a size_t.

With the type change, some printf() specifiers needed to change also.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/933
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