girwriter: Fix methods returning non-null structs
girwriter: Fix methods returning non-null structs

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