GDBus: Make sure signals are disconnected when unregistering an object
GDBus: Make sure signals are disconnected when unregistering an object

spidermonkdust/vala,rvu95/vala,severinh/vala,tjol/vala-tjol,rvu95/vala,flobrosch/vala-fixes,kamanashisroy/aroop,kamanashisroy/aroop,spidermonkdust/vala,jessevdk/vala,flobrosch/vala-fixes,GNOME/vala,GNOME/vala,playya/vala,xdave/pvala,Distrotech/vala,spidermonkdust/vala,severinh/vala,playya/vala,frida/vala,jessevdk/vala,rvu95/vala,jessevdk/vala,frida/vala,severinh/vala,kamanashisroy/aroop,frida/vala,Distrotech/vala,GNOME/vala,frida/vala,playya/vala,Distrotech/vala,tjol/vala-tjol,frida/vala,GNOME/vala,flobrosch/vala-fixes,tjol/vala-tjol