Fix a gcc warning when returning struct in an interface method
Fix a gcc warning when returning struct in an interface method

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