[gedit] Style fix related to previous commit

[Pietro Battiston <pbattiston src gnome org>]

commit 3bdfa5764deb9909dae9ef041a7e9b6d6297341a
Author: Pietro Battiston <pbattiston src gnome org>
Date:   Wed Nov 30 10:16:17 2016 +0100

    Style fix related to previous commit
    
    See f4ecdcb8807fec2594f62bf7a7f179063f31e41b

 gedit/gedit-app.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gedit/gedit-app.c b/gedit/gedit-app.c
index 2fbcd25..072dde8 100644
--- a/gedit/gedit-app.c
+++ b/gedit/gedit-app.c
@@ -1712,7 +1712,7 @@ find_extension_point_section (GMenuModel  *model,
 
                        subsection = g_menu_model_get_item_link (model, i, G_MENU_LINK_SECTION);
 
-                       if (!subsection)
+                       if (subsection == NULL)
                        {
                                subsection = model;
                        }