file system message getter func

memory/FileSystemMessage.cpp

@@ -59,3 +59,8 @@ void FileSystemMessage::setFailureReply(CommandMessage *message,
     message->setCommand(COMPLETION_SUCCESS);
     message->setParameter(errorCode);
 }
+
+ReturnValue_t FileSystemMessage::getFailureReply(
+		const CommandMessage *message) {
+	return message->getParameter();
+}

memory/FileSystemMessage.h

@@ -32,6 +32,8 @@ public:
 	static store_address_t getStoreId( const CommandMessage* message );
 	static void setSuccessReply(CommandMessage* message);
 	static void setFailureReply(CommandMessage* message, ReturnValue_t errorCode);
+
+	static ReturnValue_t getFailureReply(const CommandMessage* message);
 };
 
 #endif /* FSFW_MEMORY_FILESYSTEMMESSAGE_H_ */