[gnome-font-viewer] model: add missing assignment

[Cosimo Cecchi <cosimoc src gnome org>]

commit 23beeecc9a3210f65daa222e0d473cf77b3b3418
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Apr 3 19:42:30 2017 -0700

    model: add missing assignment

 src/font-model.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/font-model.c b/src/font-model.c
index fb303cc..a754573 100644
--- a/src/font-model.c
+++ b/src/font-model.c
@@ -517,6 +517,8 @@ static gboolean
 ensure_font_list_idle (gpointer user_data)
 {
     FontViewModel *self = user_data;
+
+    self->priv->font_list_idle_id = 0;
     ensure_font_list (self);
 
     return FALSE;