RTEMS | cpukit/dev/can/can-bittiming.c: remove calls to abs() (!738)

[Michal Lenc (@michallenc)]

Michal Lenc created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/738

Project:Branches: michallenc/rtems:can-bittiming-remove-abs to rtems/rtos/rtems:main
Author:   Michal Lenc




## Summary

cpukit/dev/can/can-bittiming.c: remove calls to abs()

Using `abs()` on unsigned integers leads to GCC warning -Wabsolute-value.
This commit removes the calls to `abs()` and replaces them with ternary
conditional operator. This keeps the correct error calculation
previously ensured by `abs()` call.

Solution as suggested in !726

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