[goffice] Compilation: unused var.

[Morten Welinder <mortenw src gnome org>]

commit 7f40e9ffd14d8531959c6a238011f92db76f9d80
Author: Morten Welinder <terra gnome org>
Date:   Sat Dec 2 17:54:44 2017 -0500

    Compilation: unused var.

 plugins/plot_surface/gog-surface.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/plugins/plot_surface/gog-surface.c b/plugins/plot_surface/gog-surface.c
index b047e7a..5339c11 100644
--- a/plugins/plot_surface/gog-surface.c
+++ b/plugins/plot_surface/gog-surface.c
@@ -124,7 +124,6 @@ gog_surface_view_render (GogView *view, GogViewAllocation const *bbox)
        GogSurfacePlot *plot = GOG_SURFACE_PLOT (view->model);
        GogSeries const *series;
        GogChartMap3D *chart_map;
-       GogChart *chart = GOG_CHART (view->model->parent);
        GogViewAllocation const *area;
        int i, imax, j, jmax, nbvalid;
        double x, y, z, x0, y0, x1, y1;