Fix T73371: Crash caused by wrong logic in NULL pointer check.

source/blender/editors/util/ed_util.c

@@ -238,15 +238,12 @@ bool ED_editors_flush_edits_for_object_ex(Main *bmain,
     /* Don't allow flushing while in the middle of a stroke (frees data in use).
      * Auto-save prevents this from happening but scripts
      * may cause a flush on saving: T53986. */
-    if ((ob->sculpt && ob->sculpt->cache) == 0) {
-
-      {
+    if (!ELEM(NULL, ob->sculpt, ob->sculpt->cache)) {
       char *needs_flush_ptr = &ob->sculpt->needs_flush_to_id;
       if (check_needs_flush && (*needs_flush_ptr == 0)) {
         return false;
       }
       *needs_flush_ptr = 0;
-      }
 
       /* flush multires changes (for sculpt) */
       multires_flush_sculpt_updates(ob);