RTEMS | Address type-limits warnings (!853)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/853

Project:Branches: joel/rtems:fix-more-type-limits-warnings to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill
Reviewer: Kinsey Moore


## Summary

These changes were made to address GCC -Wtype-limits warnings. Many times, it is comparison of an unsigned integer to be within the range 0..some_limit (X >= 0 && X <= some_limit). Since the type is unsigned, it cannot be <0. In other cases, the code was using an unsigned type where a return value was signed and -1 was an error. Comments were added in many cases to explain the removal of checks.

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