[PATCH 3/4] dsound: Compute mix buffer's size more accurately

[Andrew Eikum]

What we need is a buffer large enough to hold the entire prebuf buffer
in floating point format. So just do that.
---
 dlls/dsound/dsound_private.h |    4 ++--
 dlls/dsound/mixer.c          |   44 +++++++++---------------------------------
 dlls/dsound/primary.c        |    8 ++------
 3 files changed, 13 insertions(+), 43 deletions(-)

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