Fixed possible undefined behaviour

[j-horner]

Similiar to that in 92059a6

[Razish]

Can this be rebased on top of master for the automated builds to run? I'm suspect of this working on MSVC.
If it works fine, it's a 👍 from me

[bartrpe]

@Razish it actually builds on MSVC, I just tested on whatever is the newest MSVC version built into Visual Studio Enterprise 2022

[Daggolin]

The check seems to be correct, but does this actually occur? Multiplayer doesn't allow for non-glm NPCs. And if I remember correctly all glm NPCs should pass through SetupGameGhoul2Model, which should ERR_DROP on invalid localAnimIndex.