util: Check result of weston_surface_animation_run.

diff --git a/src/util.c b/src/util.c
index 4390e2e..306c797 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -265,6 +265,9 @@ weston_slide_run(struct weston_surface *surface, float start, float stop,
 
        animation = weston_surface_animation_run(surface, start, stop,
                                                 slide_frame, done, data);
+       if (!animation)
+               return NULL;
+
        animation->spring.friction = 900;
        animation->spring.k = 300;