[gspell] language: use g_tree_unref() instead of g_tree_destroy()

[Sébastien Wilmet <swilmet src gnome org>]

commit 1926dc60976b1f5c5847aa76b2e5fd4210982908
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Dec 27 18:52:46 2015 +0100

    language: use g_tree_unref() instead of g_tree_destroy()

 gspell/gspell-language.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gspell/gspell-language.c b/gspell/gspell-language.c
index e7915db..fc18373 100644
--- a/gspell/gspell-language.c
+++ b/gspell/gspell-language.c
@@ -388,7 +388,7 @@ gspell_language_get_available (void)
                        (GTraverseFunc) spell_language_traverse_cb,
                        &available_languages);
 
-       g_tree_destroy (tree);
+       g_tree_unref (tree);
 
        return available_languages;
 }