egl/wayland: Implement swrast support

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>.

Signed-off-by: Axel Davy <axel.davy@ens.fr>
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 169abcc..467b81c 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -729,7 +729,10 @@
 #endif
 #ifdef HAVE_WAYLAND_PLATFORM
    case _EGL_PLATFORM_WAYLAND:
-      wl_drm_destroy(dri2_dpy->wl_drm);
+      if (dri2_dpy->wl_drm)
+          wl_drm_destroy(dri2_dpy->wl_drm);
+      if (dri2_dpy->wl_shm)
+          wl_shm_destroy(dri2_dpy->wl_shm);
       wl_registry_destroy(dri2_dpy->wl_registry);
       wl_event_queue_destroy(dri2_dpy->wl_queue);
       if (dri2_dpy->own_device) {