silence MSVC warning

‘*/‘ found outside of comment

source/blender/compositor/operations/COM_CalculateMeanOperation.cpp

@@ -46,7 +46,7 @@ void CalculateMeanOperation::initExecution()
 
 void CalculateMeanOperation::executePixel(float output[4],
                                           int /*x*/, int /*y*/,
-                                          void */*data*/)
+                                          void * /*data*/)
 {
 	output[0] = this->m_result;
 }