[gtk] inspector: Fix an uninitialized value warning

[Timm Bäder <baedert src gnome org>]

commit 9d0e8b85c1d7b5c672f1b6ab87a64c56f7d5c646
Author: Timm Bäder <mail baedert org>
Date:   Fri Feb 22 19:22:58 2019 +0100

    inspector: Fix an uninitialized value warning

 gtk/inspector/fpsoverlay.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/inspector/fpsoverlay.c b/gtk/inspector/fpsoverlay.c
index 5a58e8689c..092e5b30c5 100644
--- a/gtk/inspector/fpsoverlay.c
+++ b/gtk/inspector/fpsoverlay.c
@@ -158,7 +158,7 @@ gtk_fps_overlay_snapshot (GtkInspectorOverlay *overlay,
   double fps;
   char *fps_string;
   graphene_rect_t bounds;
-  gboolean has_bounds;
+  gboolean has_bounds = FALSE;
   int width, height;
   double overlay_opacity;