RTEMS | fix system fatal error caused by imperfect user input commands, e.g. "rtl sym -u" (!158)

[shuhua huang (@shuhua_huang)]

shuhua huang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/158

Project:Branches: shuhua_huang/rtems:shuhua_huang-main-patch-58477 to rtems/rtos/rtems:main
Author:   shuhua huang




## Summary

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I found that ,when i input "rtl sym -u ",the system will fatal error "fatal source: 9 (RTEMS_FATAL_SOURCE_EXCEPTION)",and i check the code,found 
"rtems_rtl_parse_arg_index" have a bug.
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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/158
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