RTEMS | bsps/shared/gpio: Fix group define leaks (!1281)

[Yang Zhang (@Chloe)]

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.\
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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.\
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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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