Return signals2::connection on LLViewerDisplayName::addNameChangedCallback()...

Return signals2::connection on LLViewerDisplayName::addNameChangedCallback() We were discarding it anyway, why not make it available to tap into?

indra/newview/llviewerdisplayname.cpp

@@ -47,9 +47,9 @@ namespace LLViewerDisplayName
 	// Fired when there is a change in the agent's name
 	name_changed_signal_t sNameChangedSignal;
 
-	void addNameChangedCallback(const name_changed_signal_t::slot_type& cb) 
+	boost::signals2::connection addNameChangedCallback(const name_changed_signal_t::slot_type& cb) 
 	{ 
-		sNameChangedSignal.connect(cb); 
+		return sNameChangedSignal.connect(cb);
 	}
 
 	void doNothing() { }

indra/newview/llviewerdisplayname.h

@@ -47,9 +47,9 @@ namespace LLViewerDisplayName
 	// unavailable or name not available.
 	void set(const std::string& display_name, const set_name_slot_t& slot);
 
-    void setDisplayNameCoro(const std::string cap_url, const LLSD body);
+	void setDisplayNameCoro(const std::string cap_url, const LLSD body);
 
-	void addNameChangedCallback(const name_changed_signal_t::slot_type& cb);
+	boost::signals2::connection addNameChangedCallback(const name_changed_signal_t::slot_type& cb);
 }
 
 #endif // LLVIEWERDISPLAYNAME_H