Yang Zhang created a merge request: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1281

Project:Branches: Chloe/rtems:fix-gpio-group-define-cleanup to 
rtems/rtos/rtems:main
Author:   Yang Zhang



## Summary

In rtems_gpio_define_pin_group(), several malloc() calls did not check their 
return values. This could lead to NULL pointer dereferences in later 
initialization steps.\
\
The previous error handling also leaked memory and hardware pin resources if an 
intermediate step, such as pin selection or lock creation, failed during 
initialization.\
\
This patch refactors the error handling to use a single cleanup path.

## AI Details

I have read the RTEMS Generative AI statement.

### Prompt used

Carefully review the correctness of my modifications in terms of null pointer 
checks and memory leak prevention.

### AI model used

Claude Sonnet 4.6 and gemini-3.1-pro-preview

### How AI was used for the contribution

- [ ] Review correctness and suggest revision.

### Access

I have not used a product that claims copyright over the generated output, and 
I have legitimate access to the AI tools used.

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https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1281
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