Fix crash when processing a wayland client cursor set after death

It looks like the only way we can get here with NULL resource data
is when we explicitly cleared it in the del hook, meaning the client
is dead to us.  In this case it's ok to ignore the cursor set request.

ref T4988

src/bin/e_comp_wl_input.c

@@ -79,6 +79,12 @@ _e_comp_wl_input_pointer_cb_cursor_set(struct wl_client *client, struct wl_resou
         return;
      }
    ec = wl_resource_get_user_data(surface_resource);
+   /* I think this only happens when we've deleted the resource from
+    * the client del callback - so the client is gone and shouldn't be
+    * setting a cursor, but the surface still exists so stale requests
+    * are being processed... let's BAIL.
+    */
+   if (!ec) return;
    if (!ec->re_manage)
      {
         ec->comp_data->cursor = ec->re_manage = 1;