codegen: Drop useless temporary variable in visit_cast_expression
codegen: Drop useless temporary variable in visit_cast_expression

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