Fix copy/paste error from 5bb5e706f1

thread_sync.c

@@ -34,7 +34,7 @@ sync_wakeup(struct list_head *head, long max)
         }
 
         if (cur->th->status != THREAD_KILLED) {
-            if (cur->th->scheduler != Qnil) {
+            if (cur->th->scheduler == Qnil) {
                 rb_threadptr_interrupt(cur->th);
                 cur->th->status = THREAD_RUNNABLE;
             }