Fix buffer overrun in ConvertAudio with different src/dst channel count #12064
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To trigger this bug, the source and destination channel count have to not match, and the source format also has to not be f32.
Description
This fixes a buffer overrun (and intermittent crash) when playing audio from the opening FMV of Bloodborne in the ShadPS4 emulator. That audio is in 8 channel, s16le format, which triggers an audio conversion code path that probably isn't very common.
Existing Issue(s)
shadps4-emu/shadPS4#2034