RTEMS | testsuites/fstests: The tftpfs read loop never calls read() (#5713)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5713



The read loop of the tftpfs test is bounded by a byte budget of type `size_t`,
and every test passes `SIZE_MAX` to say that there is no budget. Commit
`bd2055cf5a` cast the budget to `ssize_t` to silence a sign compare warning,
which turned `SIZE_MAX` into `-1`, so the loop condition is false right away and
`read()` is never called.

Found while running the full test suite on eleven simulators. This description
was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5713
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