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nyanmisaka ff48edd8b2 hwcontext_vulkan: fix double free when vulkan_map_to_drm fails
The multiplanar image with storage_bit enabled fails to be exported
to DMA-BUF on the QCOM turnip driver, thus triggering this double-free issue.

```
[Parsed_hwmap_2 @ 0xffff5c002a70] Configure hwmap vulkan -> drm_prime.
[hwmap @ 0xffff5c001180] Filter input: vulkan, 1920x1080 (0).
[AVHWFramesContext @ 0xffff5c004e00] Unable to export the image as a FD!
free(): double free detected in tcache 2
Aborted
```

Additionally, add back an av_unused attribute. Otherwise, the compiler
will complain about unused variables when CUDA is not enabled.

Signed-off-by: nyanmisaka <nst799610810@gmail.com>
(cherry picked from commit ab7b6ef0a2)
Assisted-by: Fairy
2026-09-27 22:53:24 +00:00
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