Free coroutine stack when releasing coroutine
Free coroutine stack when releasing coroutine

The coroutine_init function mmap's a stack for the
ucontext coroutine, but nothing ever munmaps it.

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

Fantu/spice-gtk,guodong/spice-gtk,SPICE/spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,SPICE/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,guodong/spice-gtk,fgouget/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,Fantu/spice-gtk,guodong/spice-gtk,SPICE/spice-gtk,Fantu/spice-gtk,flexVDI/spice-gtk,fgouget/spice-gtk,elmarco/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,elmarco/spice-gtk,guodong/spice-gtk,flexVDI/spice-gtk,elmarco/spice-gtk