init AO buffer to sane values to avoid nan/inf values


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1576 b412e182-2ed4-4078-95c4-27dc59f57fa9
AO init fix


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1577 b412e182-2ed4-4078-95c4-27dc59f57fa9