multi-resource: remove an unnecessary call of wl_display_get_fd()
multi-resource: remove an unnecessary call of wl_display_get_fd()

Signed-off-by: Ryo Munakata <b0e96e5000c47678832fb87f79b32c3d1828548c@gmail.com>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

Fantu/compositor-spice,Fantu/compositor-spice,mchalupa/weston,eyolfson/weston,xorgy/weston,Gnurou/weston,sir-murray/weston,krezovic/weston,krezovic/weston,kwm81/weston,mchalupa/weston,jonnylamb/weston,udoprog/weston,Gnurou/weston,udoprog/weston,giucam/weston,Fantu/compositor-spice,sir-murray/weston,kwm81/weston,Tarnyko/weston-xdg_surface_present,xorgy/weston,Tarnyko/weston-xdg_surface_present,giucam/weston,jonnylamb/weston,eyolfson/weston