[gtksourceview] Fix compiler warning

[Paolo Borelli <pborelli src gnome org>]

commit 622481a53d4de4afe0c5f05cae8535588c477234
Author: Philipp <pdll13 gmail com>
Date:   Mon Dec 28 17:16:00 2015 +0000

    Fix compiler warning
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759930

 gtksourceview/gtksourcegutter.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourcegutter.c b/gtksourceview/gtksourcegutter.c
index a46b12b..e8c4191 100644
--- a/gtksourceview/gtksourcegutter.c
+++ b/gtksourceview/gtksourcegutter.c
@@ -1455,9 +1455,9 @@ redraw_for_window (GtkSourceGutter *gutter,
                    gint             y)
 {
        Renderer *at_x = NULL;
+       gint start = 0;
        GList *item;
        gboolean redraw;
-       gint start;
 
        if (event->window != get_window (gutter) && act_on_window)
        {