codegen: Drop unnecessary comma expressions in return statements
codegen: Drop unnecessary comma expressions in return statements

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