libfilezilla thread.cpp contains a bug

[ckelsel]

impl_->handle_ = reinterpret_cast<HANDLE>(_beginthreadex(0, 0, thread_proc, impl_, 0, 0));
if (impl_->handle_ == INVALID_HANDLE_VALUE) {
...
}

_beginthreadex return 0 on error , while compare to INVALID_HANDLE_VALUE(-1)

#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)

On an error, _beginthreadex returns 0, and errno and _doserrno are set.
​https://msdn.microsoft.com/en-us/library/kdzttdcb.aspx

[Tim Kosse]

Thanks, a fix has been committed to the repository.