Fixes leaking fds created by 'pipe()' call #2745
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Updates the
lws_pt_destroy()
logic to ensure the pipe fds are closed if eitherpt->dummy_pipe_fds[0]
orpt->dummy_pipe_fds[1]
are still valid (previously was only checkingpt->dummy_pipe_fds[0]
which was resulting in the write fd to leak whenever a context was destroyed).Potential fix for issue: #2744