winmm: Initialize Memory in mciSendStringA

[Rico Schüller]

Hi,

this patch fixes bug 17518, where the length of lpwstrRet in 
WideCharToMultiByte is taken from uninitialized data. This could crash 
the app.

Cheers
Rico

---
  dlls/winmm/mci.c       |    5 ++++-
  dlls/winmm/tests/mci.c |    2 +-
  2 files changed, 5 insertions(+), 2 deletions(-)


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