[PATCH] winmm: RegQueryValueExW wants the size in bytes, not the size in characters.

[Carlo Bramini]

There is a bug into dlls/winmm/playsound.c
Function RegQueryValueExW accepts the size in bytes as parameter, not the size 
in characters.

See:
https://msdn.microsoft.com/en-us/library/windows/desktop/ms724911(v=vs.85).
aspx

Sincerely.

Signed-off-by: Carlo Bramini <carlo_bramini at users.sourceforge.net> 

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