mock_Verify functions should ideally not modify the state of the mock.

In typical unit tests, this doesn't matter since the Verify functions
are called only from the end of the test.  However, in longer integration
tests, where a sequence of function calls is to be tested, it's handy
to be able to verify the Expects halfway through the test.  This change
is a first step in making that possible.

lib/cmock_generator_plugin_callback.rb

@@ -92,7 +92,7 @@ class CMockGeneratorPluginCallback
 
   def mock_verify(function)
     func_name = function[:name]
-    "  if (Mock.#{func_name}_CallbackFunctionPointer != NULL)\n    Mock.#{func_name}_CallInstance = CMOCK_GUTS_NONE;\n"
+    "  if (Mock.#{func_name}_CallbackFunctionPointer != NULL)\n    call_instance = CMOCK_GUTS_NONE;\n"
   end
 
 end