[gnome-control-center] shell: Initialize variable

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 693df19026955017f68eb4616fd745b428300432
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Jan 17 23:14:09 2018 -0200

    shell: Initialize variable
    
    In practice, this is never uninitialized, but the
    compiler is complaining anyway, so let's play the
    conservative and make sure it's always initialized
    to NULL.

 shell/cc-window.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/shell/cc-window.c b/shell/cc-window.c
index fc7779f..ffe8928 100644
--- a/shell/cc-window.c
+++ b/shell/cc-window.c
@@ -236,6 +236,7 @@ update_list_title (CcWindow *self)
   const gchar *title;
 
   view = cc_panel_list_get_view (CC_PANEL_LIST (self->panel_list));
+  title = NULL;
 
   switch (view)
     {