fix code listener logic bug

next's position was only updated initially
previous logic relied on pushing everything long rightly
but it wasn't right, and no harm in setting position twice,
as events only fire if there is real change

test/risc/test_linker.rb

@@ -17,19 +17,6 @@ module Risc
       assert_raises {@machine.add_constant( 1 )}
     end
   end
-  class TestMachinePos < MiniTest::Test
-    def setup
-      Parfait.boot!
-      Risc.boot!
-      @linker = Mom::MomCompiler.new.translate(:arm)
-      @linker.position_all
-    end
-    def test_positions_set
-      @linker.object_positions.each do |obj , position|
-        assert Position.get(obj).valid? , "#{Position.get(obj)} , #{obj.object_id.to_s(16)}"
-      end
-    end
-  end
   class TestMachineInit < MiniTest::Test
     def setup
       Parfait.boot!
@@ -60,6 +47,5 @@ module Risc
         assert position.valid? , "#{position} , #{obj.object_id.to_s(16)}"
       end
     end
-
   end
 end