Make some int->pointer casts explicit
Make some int->pointer casts explicit

Tell the compiler that was really do intend to cast from int
to pointer, to prevent warnings about implicit casts

* server/tests/test_display_base.c: Add explicit casts

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

freedesktop-unofficial-mirror/spice__spice,elmarco/spice,mathslinux/spice,dezelin/spice,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,alon/spice-server,dezelin/spice,Fantu/spice,Fantu/spice,elmarco/spice,SPICE/spice,freedesktop-unofficial-mirror/spice__spice,fgouget/spice,alon/spice-server,ya-mouse/spice,elmarco/spice,freedesktop-unofficial-mirror/spice__spice,dezelin/spice,fgouget/spice,ya-mouse/spice,Fantu/spice,SPICE/spice,mathslinux/spice,mathslinux/spice,ya-mouse/spice,mathslinux/spice,elmarco/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,Fantu/spice,SPICE/spice,fgouget/spice,alon/spice-server,dezelin/spice,mathslinux/spice,elmarco/spice,alon/spice-server,dezelin/spice