RTEMS | can: fix -Wsign-compare warnings (!873)

[Michal Lenc (@michallenc)]

Michal Lenc created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/873

Project:Branches: michallenc/rtems:can-gcc-watnings to rtems/rtos/rtems:main
Author:   Michal Lenc




## Summary

Fixes `-Wsign-compare` compile warnings in CAN code. This introduces
the change in `rtems_ctucanfd_initialize` where `ntxbufs` is changed from
int to unsigned int, thus making the `ntxbufs < 0` check obsolete.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/873
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