correct preprocessor define now used

memory/MemoryHelper.cpp

@@ -16,7 +16,7 @@ ReturnValue_t MemoryHelper::handleMemoryCommand(CommandMessage* message) {
 	lastSender = message->getSender();
 	lastCommand = message->getCommand();
 	if (busy) {
-#if CPP_OSTREAM_ENABLED == 1
+#if FSFW_CPP_OSTREAM_ENABLED == 1
 		sif::debug << "MemHelper: Busy!" << std::endl;
 #endif
 	}