session: Removed write-only variable
session: Removed write-only variable

Acked-by: Marc-André Lureau <f20011f729ce65c6b731da6d94357379565098f1@redhat.com>

fgouget/spice-gtk,fgouget/spice-gtk,fgouget/spice-gtk,flexVDI/spice-gtk,flexVDI/spice-gtk