Correct minor typo that got biffed during the cleanup leading to the previous commit.
Correct minor typo that got biffed during the cleanup leading to the
previous commit.

svn path=/trunk/; revision=2391

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