[PATCH] winmm: Fix handling of mmio file buffers. (try 2)

[Akihiro Sagawa]

This fixes bug 19566.
Try 2: add offset range check to fix avifil32 test failure.
---
 dlls/winmm/mmio.c       |   32 ++++++++++++++------------------
 dlls/winmm/tests/mmio.c |   16 ++++++++--------
 2 files changed, 22 insertions(+), 26 deletions(-)

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