When len is zero (to obtain the length needed), nothing is written to `output`, even though the rewrite (correctly) uses WideCharToMultiByte on the output to determine the returned length. But this leads to reading garbage uninitialized values instead of the proper value.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/2351
Silences a very common warning.
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v3: vkd3d-shader/dxbc: Validate and skip the signature section header size.
vkd3d-shader/dxbc: Emit a shader error for an invalid signature data size.
vkd3d-shader/dxbc: Pass a message context to for_each_dxbc_section().
https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/113