clear to close the inputstream before attempting to delete the temp file, which
is plausible as the windows-specific failure in earlier attempts at this

Change-Id: I751aa3a098dd960f56b77a5f5fc93783c1060556
Reviewed-on: https://gerrit.libreoffice.org/17531Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>