RTEMS | msdos: Fix file truncated to 0 (!177)

[Loris Nardo (@loris.nardo)]

Loris Nardo created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/177

Project:Branches: loris.nardo/rtems:fat-truncate-0 to rtems/rtos/rtems:main
Author:   Loris Nardo




## Summary

msdos: Fix file truncated to 0

Previously the first cluster of the file was not updated when truncating to 0 but was in any case freed.
Now the first cluster of the file is updated during the truncation, leaving the directory entry in a consistent state.

Closes #2757


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/177
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