D-Bus: Fix uninitialized error variable in servers
D-Bus: Fix uninitialized error variable in servers

frida/vala,themiwi/vala,flobrosch/vala-fixes,tjol/vala-tjol,kamanashisroy/aroop,frida/vala,rvu95/vala,jessevdk/vala,GNOME/vala,frida/vala,Distrotech/vala,Distrotech/vala,playya/vala,rvu95/vala,spidermonkdust/vala,spidermonkdust/vala,Jc2k/vala,spidermonkdust/vala,jessevdk/vala,xdave/pvala,GNOME/vala,phako/vala,themiwi/vala,Distrotech/vala,themiwi/vala,lovebug356/vala,frida/vala,jessevdk/vala,severinh/vala,frida/vala,phako/vala,lovebug356/vala,kamanashisroy/aroop,tjol/vala-tjol,rvu95/vala,flobrosch/vala-fixes,GNOME/vala,tjol/vala-tjol,flobrosch/vala-fixes,severinh/vala,Jc2k/vala,playya/vala,GNOME/vala,kamanashisroy/aroop,playya/vala,severinh/vala