D-Bus: Fix static modifiers for helper functions
D-Bus: Fix static modifiers for helper functions

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