Ensure output file is closed in plD_tidy_cairo - closes bug #1874660.
Ensure output file is closed in plD_tidy_cairo - closes bug #1874660.


svn path=/trunk/; revision=8150

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot