[gnome-builder] cursor: always initialize to NULL

[Christian Hergert <chergert src gnome org>]

commit dbc8274b221e6c047843f72c157d244d5a7b5194
Author: Christian Hergert <chergert redhat com>
Date:   Mon May 8 14:48:26 2017 -0700

    cursor: always initialize to NULL
    
    Fixes CID 168949.

 libide/sourceview/ide-cursor.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libide/sourceview/ide-cursor.c b/libide/sourceview/ide-cursor.c
index f794f95..ebbd82c 100644
--- a/libide/sourceview/ide-cursor.c
+++ b/libide/sourceview/ide-cursor.c
@@ -74,7 +74,7 @@ static void
 ide_cursor_dispose (GObject *object)
 {
   IdeCursor *self = (IdeCursor *)object;
-  GtkTextBuffer *buffer;
+  GtkTextBuffer *buffer = NULL;
 
   g_return_if_fail (IDE_IS_CURSOR (self));