Fix xexun decoder (fix #460)
Fix xexun decoder (fix #460)

renaudallard/traccar,vipien/traccar,AnshulJain1985/Roadcast-Tracker,stalien/traccar_test,tsmgeek/traccar,tananaev/traccar,tananaev/traccar,jssenyange/traccar,orcoliver/traccar,duke2906/traccar,jssenyange/traccar,5of9/traccar,jon-stumpf/traccar,tsmgeek/traccar,tsmgeek/traccar,joseant/traccar-1,duke2906/traccar,ninioe/traccar,orcoliver/traccar,al3x1s/traccar,ninioe/traccar,jon-stumpf/traccar,jon-stumpf/traccar,orcoliver/traccar,ninioe/traccar,stalien/traccar_test,al3x1s/traccar,jssenyange/traccar,5of9/traccar,joseant/traccar-1,AnshulJain1985/Roadcast-Tracker,vipien/traccar,renaudallard/traccar,tananaev/traccar