windows: fix buffer overflow on uv__getnameinfo_work()
windows: fix buffer overflow on uv__getnameinfo_work()

According to
http://msdn.microsoft.com/en-us/library/windows/desktop/ms738531.aspx,
"NodeBufferSize" and "ServiceBufferSize" parameters of GetNameInfoW()
function are expected to represent the number of WCHAR, not the buffer size
of memory layout.

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