Make function const

Author: Murmele

include/libdbc/message.hpp

@@ -31,7 +31,9 @@ struct Message {
 	void appendSignal(const Signal& signal);
 	const std::vector<Signal> getSignals() const;
 	uint32_t id() const;
-    const std::string& name() {return m_name;}
+	const std::string& name() const {
+		return m_name;
+	}
 	void addValueDescription(const std::string& signal_name, const std::vector<Signal::SignalValueDescriptions>&);
 
 	virtual bool operator==(const Message& rhs) const;