Use explicit return statement following what is done for plplotcanvas_animation.c.  Without this change plplotcanvas_demo returns a non-zero status.
Use explicit return statement following what is done for
plplotcanvas_animation.c.  Without this change plplotcanvas_demo returns a
non-zero status.


svn path=/trunk/; revision=9332

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