[gtksourceview] FileSaver: fix a bug with g_file_equal()

[Sébastien Wilmet <swilmet src gnome org>]

commit 17d9d7709f606b74882ab05e172d03bf6a87b7ff
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Aug 1 15:15:06 2014 +0200

    FileSaver: fix a bug with g_file_equal()
    
    g_file_equal() doesn't accept NULL parameters.
    priv->location is never NULL, but prev_location can be NULL.

 gtksourceview/gtksourcefilesaver.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourcefilesaver.c b/gtksourceview/gtksourcefilesaver.c
index c36933d..d5a65e2 100644
--- a/gtksourceview/gtksourcefilesaver.c
+++ b/gtksourceview/gtksourcefilesaver.c
@@ -929,7 +929,8 @@ check_externally_modified (GtkSourceFileSaver *saver)
                 * because the user has normally accepted to overwrite the file if it
                 * already exists.
                 */
-               save_as = !g_file_equal (prev_location, saver->priv->location);
+               save_as = (prev_location == NULL ||
+                          !g_file_equal (prev_location, saver->priv->location));
        }