RTEMS | flashdisk.c: Fixed garbage name generation and added memory cleanup (!912)

[Prakhar Kumar (@prakhar)]

Prakhar Kumar created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/912

Project:Branches: prakhar/rtems:flashdisk_initialize_fix to rtems/rtos/rtems:main
Author:   Prakhar Kumar




## Summary

The flashdisk initialize function modified the character at the position returned by sizeof(RTEMS_FLASHDISK_DEVICE_BASE_NAME), which points past the intended device suffix and results in undefined behavior. 

Adjust the index to update the suffix character directly, ensuring correct device names (fdda, fddb, ...) and also added memory cleanup

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/912
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