RTEMS | bsp/arm/tms570: protect against baud rate divide-by-zero (!1216)

[Avi Weiss (@thnkslprpt)]

Avi Weiss created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1216

Project:Branches: thnkslprpt/rtems:fix-5555-protect-against-baud-zero to rtems/rtos/rtems:main
Author:   Avi Weiss



## Summary

Fixes #5555   

`tms570_sci_set_attributes` has no protection against 0 baud rate  

`rtems_termios_baud_to_number` documentation shows it can return 0  

Can result in divide by zero inside `tms570_sci_set_attributes` in at least one or two locations (and then also `tms570_sci_interrupt_last_close`).  

This change safely returns false if we end up somehow with a 0 `baudrate` value.  

Separate (2nd) commit addresses some typos + applies RTEMS clang_format preferences.

## Generative AI
None

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1216
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