[gnome-power-manager] trivial: Fix a warning when using abs() on doubles

[Richard Hughes <rhughes src gnome org>]

commit dbb4dfb2882dd436a1294b9172b5892f07d83589
Author: Richard Hughes <richard hughsie com>
Date:   Thu Feb 7 10:26:46 2019 +0000

    trivial: Fix a warning when using abs() on doubles

 src/egg-graph-widget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/egg-graph-widget.c b/src/egg-graph-widget.c
index e0638160..7c2fc9ed 100644
--- a/src/egg-graph-widget.c
+++ b/src/egg-graph-widget.c
@@ -801,7 +801,7 @@ egg_graph_widget_autorange_y (EggGraphWidget *graph)
         * positive parts */
        if (priv->start_y < 0.f && priv->stop_y > 0.f &&
            priv->type_y == EGG_GRAPH_WIDGET_KIND_FACTOR) {
-               if (abs (priv->stop_y) > abs (priv->start_y))
+               if (fabs (priv->stop_y) > fabs (priv->start_y))
                        priv->start_y = -priv->stop_y;
                else
                        priv->stop_y = -priv->start_y;