## About The Pull Request
Brain traumas caused by head wounds are stored as a reference on the
wound, but certain brain traumas (like split personality) `qdel`
themselves in `on_gain()` if conditions aren't valid for them to exist,
`/obj/item/organ/brain/proc/brain_gain_trauma` returns a reference even
if this happens, leading to the ref being stored on the wound and
preventing the trauma from being fully deleted.
## Why It's Good For The Game
Fixes#87752
## Changelog
No player facing changes
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Co-authored-by: LemonInTheDark <58055496+LemonInTheDark@users.noreply.github.com>
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