Unnecessary line picked up by lint.

doplot.go

@@ -79,7 +79,6 @@ func doplot(pi, stdErr []float32, plotName string) error {
 	pStd.Title.Text = "standard error"
 	pStd.Y.Label.Text = "std error"
 
-	pAbs = plot.New()
 	{
 		tmperr := make([]float32, len(pi)) // the extra bracing makes
 		for i := range tmperr {            // the lifetime of tmperr clear