Merge branch 'maint-1.6.0' into maint-1.6.1

* maint-1.6.0:
  State the effect of filter-branch on graft explicitly
  process_{tree,blob}: Remove useless xstrdup calls

builtin-pack-objects.c

@@ -1905,6 +1905,8 @@ static void show_object(struct object_array_entry *p)
 	add_preferred_base_object(p->name);
 	add_object_entry(p->item->sha1, p->item->type, p->name, 0);
 	p->item->flags |= OBJECT_ADDED;
+	free((char *)p->name);
+	p->name = NULL;
 }
 
 static void show_edge(struct commit *commit)