[sysprof] line-visualizer: clear line info to visible black

[Christian Hergert <chergert src gnome org>]

commit 138f08d4fe79cd838540826efc6b17fb7bc1bee3
Author: Christian Hergert <chergert redhat com>
Date:   Thu May 17 20:31:29 2018 +0100

    line-visualizer: clear line info to visible black

 lib/visualizers/sp-line-visualizer-row.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/lib/visualizers/sp-line-visualizer-row.c b/lib/visualizers/sp-line-visualizer-row.c
index b0d7658..99a58ba 100644
--- a/lib/visualizers/sp-line-visualizer-row.c
+++ b/lib/visualizers/sp-line-visualizer-row.c
@@ -481,6 +481,7 @@ sp_line_visualizer_row_add_counter (SpLineVisualizerRow *self,
     }
   else
     {
+      gdk_rgba_parse (&line_info.foreground, "#000");
       line_info.use_default_style = TRUE;
     }