RTEMS | cpukit/libmisc/shell:fix command df overflow (!210)

[xiaojun zheng (@zhengxiaojun)]

xiaojun zheng created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/210

Project:Branches: zhengxiaojun/rtems:fix_libmisc_df to rtems/rtos/rtems:main
Author:   xiaojun zheng




## Summary

cpukit/libmisc/shell:fix command df overflow

  - change type unsigned to uint64_t, it might overflowed if
    the size is greater the 4GB.
  - increase buffer size is to eliminate the compiler's warning
    that the buffer might be too small


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/210
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