mpm_winnt: clear OVERLAPPED structs before reuse
MSDN documentation states that Any unused members of [an OVERLAPPED] structure should always be initialized to zero before the structure is used in a function call. Otherwise, the function may fail and return ERROR_INVALID_PARAMETER. Prior to this patch, the internal state left over from previous overlapped I/O was passed into the next call. It's unclear what effect this might have, if any. (I have not personally witnessed an ERROR_INVALID_PARAMETER myself.) git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1758310 13f79535-47bb-0310-9956-ffa450edef68
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