vala: Transfer floating-reference attribute while casting
vala: Transfer floating-reference attribute while casting

https://bugzilla.gnome.org/show_bug.cgi?id=795920

frida/vala,frida/vala,GNOME/vala,GNOME/vala,frida/vala,frida/vala,GNOME/vala,GNOME/vala,frida/vala