Ensure that CloseHandle() can't clobber the errno we set for
failure exits, and make a couple of tweaks for pgindent.

Juan José Santamaría Flecha

Discussion: https://postgr.es/m/CAC+AXB0g44SbvSpC86o_1HWh8TAU2pZrMRW6tJT-dkijotx5Qg@mail.gmail.com