codegen: Fix out parameters in void methods
codegen: Fix out parameters in void methods

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