[recipes] Fix a length mismatch in shopping list saving

[Matthias Clasen <matthiasc src gnome org>]

commit 4a83b7eaa18c0422ff00e4b68250fee8d1089ca8
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Mar 3 18:11:39 2017 -0500

    Fix a length mismatch in shopping list saving
    
    I haven't been able to reproduce the crash in
    https://bugzilla.gnome.org/show_bug.cgi?id=779539
    but this change might fix it.

 src/gr-recipe-store.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/gr-recipe-store.c b/src/gr-recipe-store.c
index ba6b65e..26197a9 100644
--- a/src/gr-recipe-store.c
+++ b/src/gr-recipe-store.c
@@ -1509,13 +1509,14 @@ gr_recipe_store_add_to_shopping (GrRecipeStore *self,
         length = g_strv_length (self->shopping);
         strv = g_new (char *, length + 2);
         strv[0] = g_strdup (id);
-        intv = g_new (int, length + 1);
+        intv = g_new (int, length + 2);
         intv[0] = serves;
         for (i = 0; i < length; i++) {
                 strv[i + 1] = self->shopping[i];
                 intv[i + 1] = self->shopping_serves[i];
         }
         strv[length + 1] = NULL;
+        intv[length + 1] = 0;
 
         g_free (self->shopping);
         g_free (self->shopping_serves);