[gedit] Use proper function to remove (unset) metadata attributes

[Sébastien Wilmet <swilmet src gnome org>]

commit 69704a5b18994dee0882189b9fcdd8cd77d574dd
Author: Sebastien Lafargue <slaf66 gmail com>
Date:   Wed Jan 8 16:57:06 2014 +0100

    Use proper function to remove (unset) metadata attributes
    
    Some code use null instead of a string so Gio complain :
    
    GLib-GIO-CRITICAL **:
     _g_file_attribute_value_get_string: assertion
    'attr->type == G_FILE_ATTRIBUTE_TYPE_STRING' failed
    
    https://bugzilla.gnome.org/show_bug.cgi?id=721798

 gedit/gedit-document.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/gedit/gedit-document.c b/gedit/gedit-document.c
index 33b4bd5..6a4090b 100644
--- a/gedit/gedit-document.c
+++ b/gedit/gedit-document.c
@@ -2995,9 +2995,7 @@ gedit_document_set_metadata (GeditDocument *doc,
                else
                {
                        /* Unset the key */
-                       g_file_info_set_attribute (info, key,
-                                                  G_FILE_ATTRIBUTE_TYPE_INVALID,
-                                                  NULL);
+                       g_file_info_remove_attribute (info, key);
                }
        }