platform/x86: msi-wmi-platform: Fix issue with LLVM

[hphilm]

When using LLVM you may get the following error otherwise:

│B│ drivers/platform/x86/msi-wmi-platform.c:718:3: error: cannot jump from switch statement to this case label
│B│   718 |                 default:
│B│       |                 ^
│B│ drivers/platform/x86/msi-wmi-platform.c:682:4: note: jump bypasses initialization of variable with __attribute__((cleanup))
│B│   682 |                         guard(mutex)(&data->wmi_lock);
│B│       |                         ^
│B│ ./include/linux/cleanup.h:419:2: note: expanded from macro 'guard'
│B│   419 |         CLASS(_name, __UNIQUE_ID(guard))
│B│       |         ^
│B│ ./include/linux/cleanup.h:300:3: note: expanded from macro 'CLASS'
│B│   300 |                 class_##_name##_constructor
│B│       |                 ^
│B│ <scratch space>:115:1: note: expanded from here
│B│   115 | class_mutex_constructor

[hphilm]

See also: hhd-dev/patchwork@590a164

[pastaq]

Please format this patch IAW documentation.

[hphilm]

The linked patch by Antheas Kapenekakis already includes the fix I added in this separate patch. We could also pull in that updated version instead.

Can you point me to the IAW documentation? Since it is an addon of an existing patch it wasn't clear on which tag may fit or the exact formatting should be in that case ...

[pastaq]

https://github.com/OpenGamingCollective/organization-governance/blob/main/kernel/kernel_patching.md

[pastaq]

If there's an updated version of the patch set not yet on ML then we should just grab that instead, rather than diverge and need to maintain it.