Fix CCode generator to treat errors as reference types
Fix CCode generator to treat errors as reference types

Fixes bug 622797.

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