Windows: Avoid potential mismatch in transfer error reporting
The default case in windows_transfer_callback() calls windows_error_str(0)
which will convert the error code returned by GetLastError() to a string.
This currently works because windows_transfer_callback() is either called
with io_result set to NO_ERROR or io_result set to GetLastError().
If windows_transfer_callback() will ever be called with io_result set
differently then the default case might report the wrong error message.
Call windows_error_str(io_result) instead to avoid this.
Closes #151
2 files changed