Remove freeze leftovers

src/hash.c

@@ -149,12 +149,6 @@ mrb_hash_set(mrb_state *mrb, mrb_value hash, mrb_value key, mrb_value val) /* mr
   return;
 }
 
-mrb_value
-mrb_hash_freeze(mrb_value hash)
-{
-  return (hash);
-}
-
 mrb_value
 mrb_hash_dup(mrb_state *mrb, mrb_value hash)
 {

src/kernel.c

@@ -807,7 +807,7 @@ retry:
  *       end
  *     end
  *     k = Klass.new
- *     k.methods[0..9]    #=> [:kMethod, :freeze, :nil?, :is_a?,
+ *     k.methods[0..9]    #=> [:kMethod, :respond_to?, :nil?, :is_a?,
  *                        #    :class, :instance_variable_set,
  *                        #    :methods, :extend, :__send__, :instance_eval]
  *     k.methods.length   #=> 42