[PATCH 0/1] MR8420: dsound: Make sure to null-terminate strings for callbacks.

[Yuxuan Shui (＠yshui)]

WideCharToMultiByte normally null-terminates the output if input length is -1,
but it doesn't do so if the output buffer is too small.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/8420