Fixed: #908 Incorrect method CMusicPlayer::previous() (patch provided by lubos)

code/ryzom/client/src/interface_v3/music_player.cpp

@@ -108,8 +108,11 @@ void CMusicPlayer::previous ()
 	if (!_Songs.empty())
 	{
 		// Point the previous song
+		if (_CurrentSong == 0)
+			_CurrentSong = _Songs.size()-1;
+		else
 			_CurrentSong--;
-		_CurrentSong%=_Songs.size();
+
 		play ();
 	}
 }